Disgusting Service!!!

I am appalled at the level of service one receives from African bank, I paid my credit card up on 12 October 2017 and 31 October they still be debited my account for a monthly installment when the balance reflecting was ZERO. I called in to ask them what the hell is going on they advised they will still debit the account even if its ZERO balance cause it is still active. I asked them to close my account and refund my money. TO which they asked me to send them PROOF OF PAYMENT WHEN THEY TOOK PAYMENT OFF VIA DEBIT ORDER. TO which I sent them a transnational report highlighted their debit order amount that was taken off and blacked out the rest of my stuff. Now they telling me I need to send them the report without the blacked out marks. Why the hell do I need to divulge whats in my account in order for me to get my money bac****! Unbelievable.