What chance do I have?

I was asked to pay some fees (400$) when withdrawing cash. I immediately deposited more funds, which left my bank account but did not appear in my trading account. My account was closed after a few hours, and if my deposit was made to my account, I would not be blocked. It’s been 10 hours since I made a deposit and I still don’t have anything. I always use the same bank card. Deposits and withdrawals are worth hundreds of thousands of pounds. I explained this to the broker and the broker asked me to pay him some "unfreeze fee" $900 to access my account.