any chance you can provide screenshots of your conversation with their support and perhaps also include where it shows that you cannot log in to your account? I am not saying that you are lying but having evidence would help people further understand your issue and it would also show that you can back up your claim.
I uploaded my document, they did not accept it. Now I can't log into my account. Error 4001.
did they say anything else after rejecting your KYC verification?