yes be interesting. Siam legal would be suggesting going to them if could do in Thailand not turning business away was my thoughts. Don't know a lawyer yet who turns away money :)
My advice is do not use the scammers saying they can do it and you don't need to go to dot they will do everything, tests paperwork etc. government has warned about this scam.
again never been asked but they can ask for proof of 20,000baht or equivalent in your own currency. I always have at least 1000aud on me. Cards get lower rate and $9 fee every time withdraw cash.