How can I apply for a COVID extension on a Non-O visa in Thailand?

Good morning everyone. I went to chiang mai immigration yesterday to get my first covid extension. My non o thai wife finished in may and I have already had a 60 day extension. My extension finishes end of December. I applied at the desk and about an hour later me and my wife where called in the back to be interviewed by the boss. He asked why I haven't got 40000 baht for the extension and my wife told him we have 3 children to take care of

He stamped my passport until the end of February and wished us good luck. 2 hours in total. Irish passport by the way.