Require to withdraw. Unable to wtihdraw. The account is frozen and require to transfer large amount deposit for verificaiton. Ask for help

I applied for a withdrawal of 20,000 USDT on the platform on July 5, 2022. As a result, my account was frozen and I was required to transfer a huge amount of funds for verification. Now I don't understand whether this practice is legal and compliant? Second, no capital injection, ask for help.