BEEN WITH FNB FOR YEARS TO BE LEFT SO DISAPOINTED...ITS A SAD STATE OF AFFAIRS

I was charged extra on a transaction from FNB, I made a payment to an international merchant, the amounts were confirmed and all was okay till FNB took the Monies, There is an extra amount taken by FNB from that transaction. I IMMEDIATELY CONTACT THE MERCHANT WHO SENDS PROOF THAT THEY HAVE RECEIVED THE CORRECT AMOUNT (SENT THE PROOF TO FNB AS WELL). I CONTACT FNB WHO TELLS ME TO SEND A DISPUTE FORM AND DISPUTE THE TRANSACTION ON MY APP. LO AND BEHOLD IN THE DISPUTE A TRANSACTION, THE AMOUNT OVERCHARGED ON MY ACCOUNT DOES NOT APPEAR AT ALL!!!!!! THE TRANSACTION IN THE DISPUTE SCREEN SHOWS THE AMOUNT THAT WAS SPPOSED TO BE CHARGED BUT DOES NOT SHOW THE OVERCHARGE (TRY TO EXPLAIN THAT TO THE CONSULTANTS WHO SEEM TO NOT WANT TO UNDERSTAND). LATER THE NEXT DAY I RECEIVE THE CHARGES OF R100 PER TRANSACTION, THE DESCRIPTION OF THE CHARGES SHOWS THE CORRECT AMOUNT THAT WAS SUPPOSED TO BE TAKEN, HOWEVER THE AMOUNT TAKEN AND THE DESCRIPTION ARE DIFFERENT, HOW IS THAT POSSIBLE?. I HAVE SENT SO MANY MAILS. I VISITED A BRANCH WHEREIN A CONSULTANT IMMEDIATELY AGREED WITH ME SAYING FNB OVERCHARGED ME BUT EVERY CONSULTANT ON THE PHONE ARE LIKE PROGRAMMED TO BLAME EVERYBODY ELSE. now my account is sitting in a negative. I am unable to make payments, nor do anything day to day. I am told by many different secure chat consultants that it takes 30 working days to investigate whilst the automatic reply mail says 5 working days. Every consultant i have spoken to at FNB all blames the merchant when it was clearly an FNB Error.. What am i suppose to do with all my debit orders, payments and day to day transactions ? I AM CURRENTLY SCRAMBLING TO SORT OUT MY DEBIT ORDERS BECAUSE FNB REQUIRES 10 - 30 WORKING DAYS TO SORT OUT THE MATTER. TRIED ASKING FOR UPDATES ALMOST EVERY SECOND DAY THROUGH SECURE CHAT AND GUESS WHAT, ZILCH, ZERO AND A GRAND NOTHING.