Shocking service from Bank

I am very shocked and disgusted with FNB as to how they have handled my Platinum acc. I have an overdraft with them and have called in numerous times and even gone into the branch to change the date that my account fees go off with them, as my salary date had changed from the 24th to the 28th. Then I received a call a month or two ago from Gerhard from FNB who asks me if I would like to reduce my overdraft, as to which I rep**** no. Gerhard then proceeds to get rude and ****y with me advising me that no money is going through my account..... I then hung up on him shocked on the way he has just spoke to me. Then in March I receive a message to kindly contact Gerhard asap with regards to debit orders returned due to insufficient funds. Very irritated and upset I call in to find out what is going on with my account as there has been money paid into my account. I then speak to a miss/mrs A naidoo who I explain what has happened and the now apparent victimization that happening to me by Gerhard. She then on a recorded line advises me that she cannot see on the system anything wrong with my account, and as to why Gerhard sent me these messages. I then tell her that I am not happy