yeah, I used to get all my extensions and stuff done at Patong without any issues at all. They didn’t even check TM-30 afaik. Only thing I’ve done there since DTV was my 90 day reporting and that was super quick and easy.
I’ve found Patong immigration office to be quite easygoing in general, but haven’t tried extending in my DTV yet. The immigration office in Phuket town was very bad when I had to get a medical extension before I got DTV. Made me pay and treated me pretty badly because of a TM-30 issue.