How can we help you??? NO ONE can help me

I have a problem with an FNB account which I was under the impression was paid up. 3 years later I opened a cheque account with FNB to find out that there is a personal loan account which has been accumulating interest for the last 3 years! FNB has never sent me a statement or tried to contact me to notify me that there is still a balance due on the account. The best is that in the 3 years I have opened a business account and financed a car through Wesbank, where as no one mentioned anything about this. I have numerous emails to different departments of FNB to please contact me so that we can resolve the matter, yet no one has made an effort to contact me and this account is just accumulating more interest each month. Still I have not been contacted to pay the money. I also requested proof from FNB (as they say all their calls are recorded) that they have tried to contact me to settle the account, as I feel it is not my responsibility to pay for all the interest incurred. I am sick and tired of phoning and being sent from one department to the next and no one being able to answer me. I have visited the branch and guess what the consultant and manager can also not assist. What must a person do to get help? Is FNB's motto not "How can we help you". You can help me by actually making an effort to help me!!! The sad thing is that interest is accumulating with each month passing and in the end my creditscore will be affected, but that does not matter to FNB.