On approx June 2023 my ability to withdraw was limited and I received an email that i was suspected of multi accounting. I assume this was due to my use of VPNs. Which i use for personal and business use.
As long as they let you verify your account once again and allowed you to play again, this previous limitation has nothing to do with what you are facing right now. I don’t find any possible and valid reason from Stake to deny your documents as long as they are written in English and are accepted as they mentioned in their rules.
As long as they accept players from Thailand, that means they surely have a system to verify every single document they claim to accept. So if you have evidence that your documents are valid, please start a case on casino guru and they will assist you better, since in many cases the stake team are better responding there.
If I understand this situation correctly [like what I wrote on my previous post, above], the situation is "simply" they reject OP's bank statement because it's written in Thai. OP has bank e-statements in alphabet [and in English]. I think it will be much faster if OP print those documents and take a photo of them and reupload it for KYC purpose. OP might need it to be wet-stamped by the bank though.
Or better yet, ask the bank to print it out for OP. That way, OP can ask them to provide all of the legalization [stamp, supervisor's signature, hand written timestamp of the document being issued, etc.] offered by the bank. I'm not sure if Thailand's bank do this, but one of the bank that I use in my country will print these statements in an embossed paper that signifies that the document were issued by them... though that's probably simply because I am holding their privilege bank account.
Having it escalated to CG [if previous cases may be used as guidelines] will only bring the same result, with extra step. Namely, they'll ask CG to ask OP to provide as above.