belinda63

Looks like you were not going to have an interview which is why they sent the second notice saying send the medicals in. Since you did not submit the medicals as instructed your case was correctly denied.
Refile.

Looks like you were not going to have an interview which is why they sent the second notice saying send the medicals in. Since you did not submit the medicals as instructed your case was correctly denied.
Refile.

The issue is he made a sworn statement for the purpose of obtaining a benefit (tourist visa) and lied on the application. Now he has to "undo" his lie. And the only way to do that is provide legitimate divorce papers from his first wife. How he would go about obtaining a divorce from someone he was never married to is what he needs to figure out. If he can somehow manage to do that legally then you will need to marry him again since your marriage is not currently legal  in the eyes of US immigration.
Do you see the issue here? According to US immigration he was legally married previously and has provided no evidence that marriage was ever ended. 

The issue is he made a sworn statement for the purpose of obtaining a benefit (tourist visa) and lied on the application. Now he has to "undo" his lie. And the only way to do that is provide legitimate divorce papers from his first wife. How he would go about obtaining a divorce from someone he was never married to is what he needs to figure out. If he can somehow manage to do that legally then you will need to marry him again since your marriage is not currently legal  in the eyes of US immigration.
Do you see the issue here? According to US immigration he was legally married previously and has provided no evidence that marriage was ever ended. 

I personally think flying to Mexico and attempting to come by road is the best option.
 
That said viewing your case as someone who entered the USA by K1, got a conditional green card and shortly after divorced her US husband and then decamped to her home country for two plus years where she married another man, if I were the immigration officer at the point of entry or uscis Officer who will adjudicate your case for removal or down the line for your new husbands petition, I’ll be very hard on you and go through your case with a fine toothed comb looking for any semi legitimate excuse to deny your petition.
 
just saying.....

From the spouse's point of view, he comes home from work, has to take the wife to work, care for the kids, stay up until 11 or midnight to wake the kids up to pick up mom. Then he has to get up at what 6 maybe 7 to go to his job. I can understand his frustration.
1. Never, ever leave a child under 12 home alone. This is a crime and dangerous.
2. Try to work out a compromise. Bike, Uber, quit the job until you get your license, etc. 
3. I this is the only major issue in the marriage both partied need to discuss it and work out a solution. I think the people who are speaking of abuse are a little to quick on the draw. I can see if I were sleep deprived being a bit short with the spouse. Not justifying just saying I can understand.

From the spouse's point of view, he comes home from work, has to take the wife to work, care for the kids, stay up until 11 or midnight to wake the kids up to pick up mom. Then he has to get up at what 6 maybe 7 to go to his job. I can understand his frustration.
1. Never, ever leave a child under 12 home alone. This is a crime and dangerous.
2. Try to work out a compromise. Bike, Uber, quit the job until you get your license, etc. 
3. I this is the only major issue in the marriage both partied need to discuss it and work out a solution. I think the people who are speaking of abuse are a little to quick on the draw. I can see if I were sleep deprived being a bit short with the spouse. Not justifying just saying I can understand.

From the spouse's point of view, he comes home from work, has to take the wife to work, care for the kids, stay up until 11 or midnight to wake the kids up to pick up mom. Then he has to get up at what 6 maybe 7 to go to his job. I can understand his frustration.
1. Never, ever leave a child under 12 home alone. This is a crime and dangerous.
2. Try to work out a compromise. Bike, Uber, quit the job until you get your license, etc. 
3. I this is the only major issue in the marriage both partied need to discuss it and work out a solution. I think the people who are speaking of abuse are a little to quick on the draw. I can see if I were sleep deprived being a bit short with the spouse. Not justifying just saying I can understand.

From the spouse's point of view, he comes home from work, has to take the wife to work, care for the kids, stay up until 11 or midnight to wake the kids up to pick up mom. Then he has to get up at what 6 maybe 7 to go to his job. I can understand his frustration.
1. Never, ever leave a child under 12 home alone. This is a crime and dangerous.
2. Try to work out a compromise. Bike, Uber, quit the job until you get your license, etc. 
3. I this is the only major issue in the marriage both partied need to discuss it and work out a solution. I think the people who are speaking of abuse are a little to quick on the draw. I can see if I were sleep deprived being a bit short with the spouse. Not justifying just saying I can understand.

From the spouse's point of view, he comes home from work, has to take the wife to work, care for the kids, stay up until 11 or midnight to wake the kids up to pick up mom. Then he has to get up at what 6 maybe 7 to go to his job. I can understand his frustration.
1. Never, ever leave a child under 12 home alone. This is a crime and dangerous.
2. Try to work out a compromise. Bike, Uber, quit the job until you get your license, etc. 
3. I this is the only major issue in the marriage both partied need to discuss it and work out a solution. I think the people who are speaking of abuse are a little to quick on the draw. I can see if I were sleep deprived being a bit short with the spouse. Not justifying just saying I can understand.

From the spouse's point of view, he comes home from work, has to take the wife to work, care for the kids, stay up until 11 or midnight to wake the kids up to pick up mom. Then he has to get up at what 6 maybe 7 to go to his job. I can understand his frustration.
1. Never, ever leave a child under 12 home alone. This is a crime and dangerous.
2. Try to work out a compromise. Bike, Uber, quit the job until you get your license, etc. 
3. I this is the only major issue in the marriage both partied need to discuss it and work out a solution. I think the people who are speaking of abuse are a little to quick on the draw. I can see if I were sleep deprived being a bit short with the spouse. Not justifying just saying I can understand.

From the spouse's point of view, he comes home from work, has to take the wife to work, care for the kids, stay up until 11 or midnight to wake the kids up to pick up mom. Then he has to get up at what 6 maybe 7 to go to his job. I can understand his frustration.
1. Never, ever leave a child under 12 home alone. This is a crime and dangerous.
2. Try to work out a compromise. Bike, Uber, quit the job until you get your license, etc. 
3. I this is the only major issue in the marriage both partied need to discuss it and work out a solution. I think the people who are speaking of abuse are a little to quick on the draw. I can see if I were sleep deprived being a bit short with the spouse. Not justifying just saying I can understand.

From the spouse's point of view, he comes home from work, has to take the wife to work, care for the kids, stay up until 11 or midnight to wake the kids up to pick up mom. Then he has to get up at what 6 maybe 7 to go to his job. I can understand his frustration.
1. Never, ever leave a child under 12 home alone. This is a crime and dangerous.
2. Try to work out a compromise. Bike, Uber, quit the job until you get your license, etc. 
3. I this is the only major issue in the marriage both partied need to discuss it and work out a solution. I think the people who are speaking of abuse are a little to quick on the draw. I can see if I were sleep deprived being a bit short with the spouse. Not justifying just saying I can understand.

From the spouse's point of view, he comes home from work, has to take the wife to work, care for the kids, stay up until 11 or midnight to wake the kids up to pick up mom. Then he has to get up at what 6 maybe 7 to go to his job. I can understand his frustration.
1. Never, ever leave a child under 12 home alone. This is a crime and dangerous.
2. Try to work out a compromise. Bike, Uber, quit the job until you get your license, etc. 
3. I this is the only major issue in the marriage both partied need to discuss it and work out a solution. I think the people who are speaking of abuse are a little to quick on the draw. I can see if I were sleep deprived being a bit short with the spouse. Not justifying just saying I can understand.

From the spouse's point of view, he comes home from work, has to take the wife to work, care for the kids, stay up until 11 or midnight to wake the kids up to pick up mom. Then he has to get up at what 6 maybe 7 to go to his job. I can understand his frustration.
1. Never, ever leave a child under 12 home alone. This is a crime and dangerous.
2. Try to work out a compromise. Bike, Uber, quit the job until you get your license, etc. 
3. I this is the only major issue in the marriage both partied need to discuss it and work out a solution. I think the people who are speaking of abuse are a little to quick on the draw. I can see if I were sleep deprived being a bit short with the spouse. Not justifying just saying I can understand.

From the spouse's point of view, he comes home from work, has to take the wife to work, care for the kids, stay up until 11 or midnight to wake the kids up to pick up mom. Then he has to get up at what 6 maybe 7 to go to his job. I can understand his frustration.
1. Never, ever leave a child under 12 home alone. This is a crime and dangerous.
2. Try to work out a compromise. Bike, Uber, quit the job until you get your license, etc. 
3. I this is the only major issue in the marriage both partied need to discuss it and work out a solution. I think the people who are speaking of abuse are a little to quick on the draw. I can see if I were sleep deprived being a bit short with the spouse. Not justifying just saying I can understand.

When you apply for the license you both will be asked if you currently single or some other verbiage to indicate you are legally free to marry. If you are already married how are you going to answer yes without lying since you are currently married.

When you apply for the license you both will be asked if you currently single or some other verbiage to indicate you are legally free to marry. If you are already married how are you going to answer yes without lying since you are currently married.

When you apply for the license you both will be asked if you currently single or some other verbiage to indicate you are legally free to marry. If you are already married how are you going to answer yes without lying since you are currently married.

When you apply for the license you both will be asked if you currently single or some other verbiage to indicate you are legally free to marry. If you are already married how are you going to answer yes without lying since you are currently married.

When you apply for the license you both will be asked if you currently single or some other verbiage to indicate you are legally free to marry. If you are already married how are you going to answer yes without lying since you are currently married.

A few things to consider here.
1. Your spouse is working illegally which will be forgiven as the spouse of a US citizen when he applies to adjust status. But his income cannot be used to sponsor him.
2. You said his employer gave him an I-9. What category was checked for it to be completed? If they marked him as a US citizen this could be a major issue.
3. You will need to follow the guidelines for filing the 1-130/I-485 concurrently to get him a green card based upon your marriage. Since you don't work and his income can't be used you will need a joint sponsor with sufficient income for their family and your spouse.

A few things to consider here.
1. Your spouse is working illegally which will be forgiven as the spouse of a US citizen when he applies to adjust status. But his income cannot be used to sponsor him.
2. You said his employer gave him an I-9. What category was checked for it to be completed? If they marked him as a US citizen this could be a major issue.
3. You will need to follow the guidelines for filing the 1-130/I-485 concurrently to get him a green card based upon your marriage. Since you don't work and his income can't be used you will need a joint sponsor with sufficient income for their family and your spouse.

A few things to consider here.
1. Your spouse is working illegally which will be forgiven as the spouse of a US citizen when he applies to adjust status. But his income cannot be used to sponsor him.
2. You said his employer gave him an I-9. What category was checked for it to be completed? If they marked him as a US citizen this could be a major issue.
3. You will need to follow the guidelines for filing the 1-130/I-485 concurrently to get him a green card based upon your marriage. Since you don't work and his income can't be used you will need a joint sponsor with sufficient income for their family and your spouse.

So if I understand you correctly:
original entry was valid until February 29 (so I assume the original entry was for 6 months)
they applied for extension in February 
They received a notice dated 9/29 granting a 6 month extension to 8/29
 
The maximum period of extension can be for up to 6 months and maximum time a person can live in US on B2 visa is 1 year, as there is a limit to the number of times you can apply for an extension B2 visa.  Where an extension of B-2 status is granted, it is for 6 months from the time of the prior validity. Given long I-539 extension request processing times, the extension is often approved (or denied) with no additional validity time.
 
So they stayed beyond the maximum allowable time in the US.  Don't understand what you were expecting.  Did you think the extension starts when you receive the extension approval notice?