We arrived 25 February on the "Test & Go'" program which gives us until 26 March. We want to extend by 15 days. The Thailand Embassy has no current info on this topic. Does anyone here know if that is possible and how? We are not in Bangkok so we can't go to the embassy now.
TLDR : Answer Summary
After arriving in Thailand on the 'Test & Go' program, which allows a stay until 26 March, you can extend your stay by an additional 30 days. The process involves going to an immigration office (not necessary to visit the embassy), where you'll need to pay a fee of 1,900 baht. Necessary documents include a passport-sized photo, copies of your passport's main page and stamped page, your departure card, and some additional paperwork. Make sure to check with local immigration for the most current procedures.