Personal Banking is a terrible idea

I was convinced to open a personal banking product with Nedbank. There was an overdraft on my old account. the personal banker assured me that it will be "moved over". They paid the overdraft on the old account yesterday. i received an SMS saying that the overdraft was sent to my new account but no money is available. I have been trying to get an explanation from the Personal Banker but she doesn't answer her phone calls and when she answers emails, she does it with an irritated and dismissive tone. Her manager, is not available either. I have been trying to get someone on the phone to explain to me what is happening since this morning and all i got was an email saying that "there was an error in the system" but no resolution time or date I would like this to be escalated as a matter of urgency