Same thing happened to me a few months ago. Went to the bank and showed them my passport , lease and mobile phone bill. Unfortunately I spoke to the wrong person and she closed my account without letting me talk to the manager. I have lived in Thailand for 3 years and use my account for daily living expenses.
The ask:thailand community, consisting of multiple Q/A groups with over 100,000 members, powers this platform. It is not an official government resource. Our members actively contribute to this resource, and while we strive for accuracy, we cannot guarantee its complete reliability. Assistance to travelers is provided as a community service.