FNB will give you a bad name

I had taken a temporary loan from FNB +- aver 4 years ago. They debited partially from my account and they just suddenly stopped. I used the account many years before taking the loan right up to 2018. My monthly salary continuously went in my account but FNB just never debited my account. After a few years realizing that I still have that outstanding loan I called the Call Centre in 2017 to make payment arrangements and they advised me to visit the branch which I did on Anton Lembede Street DBN. They told me in the branch they wont be able to help me and they called the call centre and made me speak to them again. The Call Centre consultant informed me I need to sort this at the branch and make a payment there. I was trying to make a payment and settle the outstanding balance and neither the branch or the Call centre could help so I walked away and left it as is. Now FNB has handed me to a legal department and debt collecting agents who harass me 24/7. Whenever they call me I explain myself, they hang up only to find someone new calling me later on the same matter and I have to go through the whole explanation again and again. Can such a big bank like FNB have such poor service ? and no track of how they collect money from clients ? what on earth is going on FNB ? I now have stopped using my FNB account and moved to another. My family and friends that use FNB I have made all stop using their accounts as well.