@David *****
that is not correct and I would have them write the reason your application for your extension was denied and filed a written appeal immediately. That has to go to the division head office to be reviewed.
There is no requirement that you work here to show 40K baht a month in income from abroad when getting a yearly extension based on marriage. It's 400K baht banked money OR 40K baht a month in to your thai bank account in your name only.
The reason people who legally work her and are married to thais get yearly extensions based on marriage rather than employment IS if you lose your job you don't lose the extension like you do on a Non-B extension