US Immigration from Vietnam

So basicly as the title had mentioned. I attended the interview with my fianc e where the officer both asked us questions. He was extremely friendly and asked 3 questions to us each. The officer congratulated us both and kept her passport informing us that she will receive her passport back in the mail with the visa. Here is the kicker, they did not ask to see any photos or any evidence of our relationship. Instead they told us to go home.

Fast forward to today, she received her passport, but with a blue slip instead. The slip basically asked for the information that we brought with us at the interview but the front counter refused to take, as well as it is NOW asking for the evidence of relationship.

I am absolutely livid right now as this is our 2nd attempt. With the difference being I was able to attend the interview this time around and front loaded the visa. Is there a way I can contact an officer directly to get this addressed immediately.

I've heard from someone that it's best to provide some sort of proof when applying for AOS. My wife came to the US on a K1 visa and we just got married and are about to apply for her AOS. Someone told me that we should have some of the following as proof as it will make our case stronger.

1. Joint bank account
2. Some bill/statement with both our names on it as proof of living together
3. an active mobile number for my spouse

Could someone confirm if this is true?

Hello everyone. I have just sponsored my fiance to come to America. We have gone to court to get our marriage license, and also went to the social security office to apply for a SSN for her. My next step is to apply for a greencard for her. As her husband, I will be the one sponsoring her but do not meet the 125% poverty income requirements, so I will use my mom as the joint sponsor. Do I fill out the I-864 and my mom fills out the I-864A?

I currently live at home with my mom, grandmother and my mom's younger brother, and my wife. I am not sure what number I should use for household size on my I-864 application? And on Part 6 section 8, should I put my mother's name along with her current income from her latest tax return transcript?

Part 6, section 21 and 22 - I'm unsure of what to check or do here. I've attached and circle below the areas that I have questions about.

I am currently in the process of preparing to help my wife out fill out her AOS/Greencard (I-485) application along with the Work EAD Permit and Travel Docs applications and have a few concerns and questions.

1. What kind of questions do they usually ask?
2. Do both you and your spouse go in together for the interview?
3. How long is the interview process and do they have translators available if needed, my wife's english isn't good?
4. Do they require you to prove that your marriage is real by asking to see a bank account with both your names on it, monthly statements or bills with our names on it, etc?
5. I have a joint-sponsor to help me with the I-864 application, if that person is retired can they still be my joint-sponsor since I do not meet the 125% poverty income rate? My household size is 3 or 4.
6. How long does the entire process take in order for my wife to receive her greencard?

Thanks in advance!

is there example of invitation letter??? My wife want her parents come visit us and our sons for 6 months. Please advice thank.