In order to keep your money safe and ensure the highest security possible, we need to comply with AML regulations and use a number of varying security methods. One of these is that all withdrawals are processed proportionally with the payment method you have used to make deposits.
This means that you can only withdraw funds via the same method that you made your deposit with. You are also only able to withdraw the amount you deposited via that method. For example, if you made a deposit via credit card, then you can only withdraw the equivalent amount back to your card.