Shocking Customer Service from MTN

I have experienced the most terrible/non existent customer service from MTN. I have been trying to resolve an issue regarding my and my wife's cell phone contracts for the past 7 months without any success. It appears that the only resolution is closing my MTN accounts and moving to another service provider. The problem is with MTN and their admin staff. Anyone with half a live brain cell should be able to resolve the problem quite easily within a matter of minutes. I have visited the MTN outlet in Ballito at least 3 times a month and have been helped by a very helpful lady, however her best efforts have not resolved the issue. I will again visit her tomorrow but I have no doubt that I will once again be disappointed. Quite simply MTN need to honour the terms of my current contract and to provide me with the correct data entitlement as per the contract and to refund me either the monthly premiums for the contract or correct the monthly data allocation and credit me accordingly. Can anyone comment as to whether MTN actually have a customer service department as customer service appears to be a totally foreign concept to them. I have been an MTN customer for the past 20 years and have never experienced this shocking service before.