Poor service

Again i have to be dealing with FNB and their poor service. I got a call from Christina Mtshali, apologizing about the fact that the system allowed me to use my money that was not in my account . First of all i received sms's that my account was on overdraft now i am being told that the account is not on overdraft the system allowed me access to funds in the account that were not available. The nerve ? was i stupid when i requested for the account to decline when there are no funds ? i made it very clear that i am not interested in any extra funds. Now this ? THE NERVE of calling me without doing any proper investigations . FNB does not know about educating their clients about their products , they always expect their clients to know what was not explained. i requested for them to listen to the call recording just to be told that they cant go back to the initial call and everything that was explained on the call ..****.........fix this because this is not a way of servicing clients....and i want this resolved , i will not be treated with such disrespect and poor customer service. Do your investigations before calling me and have a proper solution to this.