You are a real talent, but your funds are frozen when buying coins.

A few days ago I deposited some U, and then my card was frozen. I called to ask for a transfer proof and transaction details. I said the transaction was for virtual currency, then they asked me to upload a picture of the C2C order as proof. Today the bank called me and said they can't unfreeze it, and told me to close my account. In this situation, I want to ask everyone, what should I do?