One of my customers ( I have a muay thai gym) had a terrible history. Had been warned at the border twice. HCM gave him the DTV and Said, good this visa is made for people like you.
Most embassys have been asking for Ltd company certification for gym for 3 months now. It's become a standard requirement actually. Congratulations on visa !!
we ( Muay Thai Fever) are running a promotion this month. 15,000 baht for 6 months. Ok it's a little bit more than what you paid but a 6 month course eliminates the chance of them issuing a tourist fever ( didn't happen to you luckily)... and well it's 6 months training too.