No Response ever! Lack of service

Hi, I used to have good service with absa. But lately I have had nothing of the sort. I pay R21 every month for my absa rewards, I receive my rewards every month since I've registered for the rewards. I pay R98 a month for unlimited swipes, so we get on average R60 a month for rewards as we swipe for petrol mainly. For the past 2 months I haven't received my rewards I keep phoning into the call centre, I get told they will call me back in 7 working days and then I phone after that and then I got told 15 working days, this was over a month ago. I have had it I called yesterday and got told I will be called by the end of business and I am still waiting for that call.They have told me that they that they didn't pay my rewards because of an absa account that is in arrears. My absa accounts are paid up to date every month, my debits go off before I know I have been paid so I have never missed a debit order. They refuse to give me any other contact details for someone in a higher position. What do I do, banks take so much as it is for every tiny transaction we do and now I must sit back and watch them take advantage of me. I have had it and very close to moving banks. This is pathetic