I received my reply this afternoon and I do not understand the procedure or the time lines or whether there are fees, etc. I received the below (translated from Spanish to English)
In reference to your visa application, we inform you that the Immigrant Visa Unit can only study your visa reissue application if you can prove that for reasons of force majeure you were unable to use the approved visa. If you think you can verify this, you should send us an email in response to this message explaining the reasons. Otherwise, the petitioner will have to file a new petition on his or her behalf in the United States.
Please send a copy of the document you mention having (VISA) as an attachment in response to this email. The file must be in PDF format (Only) to be able to be reviewed and later provide you with additional information.
Please note that, due to security restrictions, we do not accept any documents that are sent as a JPG image or located in compressed folders such as zip, or in cloud storage services such as Google Drive /Docs, Dropbox or OneDrive.
We hope this information is useful.