FNB CREDIT CARD TAKES PAYMENT TWICE

On the 26th of April 2018 I made a payment into my credit card via my fnb cheque account. I do this every month so that FNB does not deduct the payment on the 1st of every month as this is a massive inconvenience as it always take 4 to 6 days before the money reflects in the credit card. So payment was made on the 26th and that payment is still in my credit card. The money is available. This morning FNB decides to deduct the amount once again which means now payment was taken twice! I have called and emailed but as always staff is ***********. I want my money reversed immediately please! When I made the payment on the 26th of April, it showed payment due on 1st R0.00 and yet here we are and my money was deducted. For me, it is pointless calling and emailing FNB continuously because it is always the same service or excuses. This is just unacceptable. I mean, you see the money paid into the credit card and yet you decide of whatever ***** the client and deduct anyways. I transfer the money every month with reason and I never have this problem and now all of a sudden FNB gets greedy and decides to take double payment.