Bad Service

I have a personal loan at Nedbank. I get paid weekly and because of that reason the debit order are set on weekly, but from January the debit goes of my account every week and the end of the month I get an sms that I'm behind on my loan and that they will deduct the hole amount. Every month I have to phone to let them know that I'm not behind and then they will sort it out. Till today its not been sorted. They even deduct two payments this week. <br> I'm not in arrears, I believe nedbank systems are not in order and that is giving me a bad credit record. <br>