I’m sorry to hear you’re not having much luck in getting an answer from Support / Billing. All I can suggest is that you either inform them that you need a refund for the tokens you have still had in the account or you get in touch with your bank.
I could suggest emailing them back stating:
Yes I know my account has been terminated for for an unknown reason that no one has explained to me, but I had tokens in my account and would be grateful for the refund.
Unfortunately I can’t get in touch with Support on your behalf as they are not allowed to discuss user accounts with a 3rd party. I have however asked that they could add in some sort of system that explains what the reason for termination and the proof of the violation in the future.