I'm not surprised. Acquaintance of mine converted 30k euro worth of crypto into euros through transfer to his EU bank account. He'd given warning to the bank through his usual contact at the bank where he was well known and had been banking for 30 years. All the same, his account was rescinded overnight, no explanation given. They (banks, governments) don't want us to do crypto. Soon the only way will be to own private wallets, buy crypto from one another, never convert to fiat, pay only trustworthy merchands (eg porn website, escort girls, drug dealers) with crypto. If you have crypto on a crypto exchange, it's high time to transfer the lot to a private wallet IMO.
The OP doesn't say from which crypto exchange he bought. From what I understand some exchanges are considered more legit than others. On the other hand, this might be a Thailand thing.