Once again acting like loan sharks!!!

I received an sms detailing that I need to make arrangements for a debit order as the 25th was a holiday. I called Nedbank to inform them that by Friday I will not have any funds in my account as I am not going to be paid by then. They assured me that they will not debit my account. They did not act in accordance with my request and still debited my account. My bank charged me R300 for the unpaid debit. I have to say even the team leader at the call centre was unfriendly and wish people would know that Nedbank will give you the greatest service offering you their products but when it comes back to paying them back they treat you like nothing. You just someone that owes them money and they will do anything ******** to get their money back! Nedbank seems to think that they can do as please in my account? Don't I have rights as a consumer? This is the third time this has happened! My account is not even in arrears!