Stopped my overdraft for no reason

I have an overdraft facility of about R28000 with Nedbank. 3 debit orders going off every month. I also often borough from this account and pay it back in reasonable amount of time ( 2 to 3 months) often. So this account was getting used and in good standing. <br> Last two or so months of last year I realized that my debit orders going of from my cheque account gets returned and I get charged penalty fees for it. I took the time and went into the bank only to find that I have a personal banker and only they can help me. I contact them and this person was on leave already. So I got assigned another temp one who should have sorted this out. Nothing ... then I called again and another personal banker helped me. He at least re-instated my overdraft. But until now they still have not reversed all my penalty fees or gave me a reason as to why my overdraft was stopped. So to me this looks like a lekke way to make money from clients. Give them overdraft and then suddenly stop it ... then penalties occur and then when one tries to reclaim that money they just ignore you. So much for having a personal banker. I would probably be better off without one and had it sorted out in bank