NOW I AM DEFAULTING MY 1ST PAYMENT !!!

I CONTACTED FNB YESTERDAY REGARDING MY FNB CREDIT CARD. THEY TRIED TO DEDUCT THE FULL STATEMENT BALANCE WHICH WAS R8500 AND SOMETHING WHEN CLEARLY ON MY ONLINE BANKING THE PAYMENT DUE WAS R811 , NOW WHEN I SPOKE TO THIS SO CALLED SENIOR CONSULTANT SHE ASSURED ME THAT THE R820 WOULD BE MY PAYMENT AND NO CHARGES WOULD AC CURE AS I CLEARLY ASKED HER THIS. AND NOW THIS MORNING THE CREDIT CARD PAYMENT CAME BACK REVERSED AND CAN YOU BELIEVE THERE WAS CHARGES. ]WHY IN THE HELL WOULD I PAY R8500 IF MY PAYMENT DUE IS R811. NOW I DEFAULTED MY 1ST PAYMENT BECAUSE SOMEONE WAS ***********. FIX THIS ****ING ISSUE TODAY!!!! I ALREADY PHONED YOUR COMPLAINTS DEP. BUT SHE DOESN'T KNOW WHAT TO DO. WILL TAKE AN ITC REPORT 3 MONTHS FROM NOW AND IF I ****ING DEFAULTED, YOU WILL HERE FROM ME