@Cui *****
I'm 82 and have 2 sons and 2 grandchildren in the USA. Retired in Thailand 22 years ago.
I'm pleased to be of help whenever I can. I contribute to this forum. And I have served for several years as Moderator on 4 other Thai Visa Advice related Facebook forums.
Suggest you try again ... this time at Vientiane.
Go to the gym and start training sessions with photos of you in training.
Provide letter to the Thai Embassy in Vientiane that while in Pattaya you visited the gym... participated in training for a month and really want to continue to train with the DTV visa.
You wish to really learn Muay Thai.
Have the gym instructor write a letter in support of your effort to continue with Muay Thai training with the DTV visa.
With his photos with you in Muay Thai shorts and gear in the gym.
Good Luck with your application. 🍀🍀🍀🍀