I've been coming for more than thirty years and there seem to be no set procedure for anything it's just the money their after. I use Tila Legal for my retirement Visa and multi entry Visa each year, Very good never had a problem, though their a little more expensive than most. The main guys name is Michael his number is
*****
2077 their at Sukhumwit soi 39 GS Tower 2 Bangkok. They can help you with almost anything including setting up a business.