I had 2 frozen accounts. I sent all the data they already had. 20 days later they are unlocked, but they never thought to tell me. Plus no explanation of why they were locked. I move to Krung Thai bank. New account opened in 15 minutes. So easy and good customer service at Krung Thai.
Krung thai seem to be quite popular. I still had a problem with them. I had multiple proofs of ID and address, including new TM30. Their own website never listed a resident certificate but the staff at my local bank insisted I must get a resident certificate. Their customer services insisted, despite whatever rules they list on their website the local branch always has full discretion to ask for anything else they choose to. I am a retired Thai uni tutor, my house owners are local vips, I have broken no rules done it all correctly snd no evidence produced anywhere by anyone for concerns, so another wait until Monday maybe to collect resident certificate from local immigration office.
each bank, each branch, sometimes each member if staff can invent their own different requirements depending on which way the wind is blowing. Happened to me last week.
last time I asked my local.office about getting my yellow book they said bith that my disabled house owner must attend the office and I can nit get a yellow book without first marrying a Thai. Plus, this yellow book requirement for a bank acvount is not consistent, it is not a universal requirement. Having a yellow book and I'd card is an option, nit a requirement. Yes it makes life easier, but getting one is a different challenge depending on your local office or which staff you talk to.
i think there was no rule at the time they opened them, the decision was an after thought. And some who have non O and OA visas when they opened are being told their accounts are frozen or being closed, but without explanation of any reason, or any evidence for any cause for concern.
I opened mine on a visa exemption and the rules were clear at the time that it was permitted. Since changing to non immigrant O this is the 3rd time to sign and submit the same documentation required to prove my I'd, the banks choose not to give any reason, so I feel disinclined to believe any explanations off Facebook. I see cases of new OA visa holders who are now having their new accounts closed a few weeks after opening. No communication, no reason, no evidence of any wrong doing or rules being violated. Many millions of baht are leaving as a result.
some were, some were or, some on a OA or different. Some being hit, some not. Some contacted, some not. Some think they will never have a problem... and next, bam. Good luck.