Withdraw (another site) Help Reqd

Genuine question, I deposited £200 on Bet 365 via a Visa credit card and have built it up too £1500 and am now looking to withdraw everything bar the original £200. Im being told I can only draw to the same card as I used to deposit.
Any ideas how I can get it back on a debit card or cheque issued?? Any advice/help appreciated.