I don’t have this verified, but I feel… knowing how Thailand works and just some common sense kind of tells me that you sign up and do everything to get approved for the DTV visa you pay the Muay Thai company, they give your proof letter etc.. then after that, I don’t think anyone gives a rats a** whether you actually go to the class or not obviously immigration is not gonna be testing your Muaythai skills, etc. The Muay Thai place got their money, so why would they care? So yea… lol
Here in Thailand, they don’t think about things that far and keep up with it . Once you get it, you got it. You can probably end up just leaving or quitting the Muay and it wouldn’t even matter. so that being said just move on do your remote job if you find one, don’t even bother updating Thai government or anything like that
If you actually read the instructions, it would have been very clear that immediately after you entered with a valid DTV, You need to purchase a pad Thai from a government approved vendor, and get proof of purchase (usually known as a receipt) and this needs to mailed to immigration within 48 hours. Once the prime minister and the King approve it, you need to report to the immigration station to pick up your certificate. The pad Thai purchase process needs to be repeated every 60 DAYS, I repeat 60 DAYS or else you risk up to 3 years in prison.