Cyber bet did say on their T&C that they will freeze the user's account if there is reasonable suspicion. they also mentioned that "the account will be frozen until the end of investigation or the relevant of suspicion cease t exist". that means the account can be released to OP earlier if the suspicion is gone. to be honest the OP already did everything needs to be done in order to prove that the account is his or no fraudulent activity has been done and I don't see the reason for freezing the account. also, it is quite suspicious that after all the KYC has been done they would still freeze the account.
8. Freezing and closing of the account
8.1. Cyber.bet reserves the right to freeze the Client’s account, in this case the funds will not be available for the Client to put in play.
Cyber.bet reserves the right to freeze the Client’s account in case there is a reasonable suspicion from the side of Cyber.bet to believe that:
the Client’s account may be used for fraudulent purposes, such as money laundering or in a manner that endangers the integrity of esports or events in which the Website offers betting services. In this case, the User will be notified about the freezing of his/her account by email specified in the Client’s account. The account will be frozen until the end of the investigation, conducted by Cyber.bet or until the cause of relevant suspicions cease to exist