various buyers
That's the prime reason you were frozen. Money laundering aside, they won't tolerate personal accounts being used for what they think is business. They'll freak even more so if it was previously dormant account.
After some noodling they'll ask you to withdraw your money and not come back.
You're better off asking here about the experiences of others -
https://old.reddit.com/r/BitcoinUK/Most banks don't tolerate the use of their services in the buying of cryptocurrencies at all, OP should have made sure that his/her bank was one of these banks before he decided to use their services, But i do believe any locked up funds may in the end be returned to the owners.