Hello everyone, I am on a TR 60 days tourist visa until mid March which I want to extend by 30 days (not COVID-extension). I am based in Bangkok but confused of where to do so. I read some posts which said that only one specific immigration office can do so - and I did not find proper information on the official website. Anyone can help me where to go (in Bangkok) and if I need to schedule an appointment in advance? Thanks a lot!