MTN commits *****

I have been way over billed by more than R650 per month on one number. I called the store that deals with our account. Very little gets done, and we get told we need to pay as MTN works with 1 month in arrears. We know this, and we paid, but something bugged me, so we did a mini audit and found that we were right and we had been paying our account correctly. Then I stated to the store we have paid up our account and that we are not in arrears in any way at all. But kept getting the same old consumer plaints line that we are billed one month in arrears. This did not help us and frustrated us even more. This went on for 2 months. We eventually submitted all the evidence and once again stated that there is something wrong and the account is not correct and something is not matching up. After arguing with the store, they did "mini" investigation of our account and found that MTN has over billed us on one number and admitted as such. But all they do is continually unsuspend the account. Then said, maybe we should pay the extra R650 that's "outstanding" and then once the investigation is done MTN will credit us therefore leaving our account in credit. Firstly, MTN owes us 2 months worth of over billed credit already. Now we need to pay more... We refuse to pay more and more money until they finally decide to actually do their jobs properly and quit messing us around. MTN is *********** and a terrible service. Why people support them still I don't know. I've never given anyone this kind of terrible service in all my years of being and IT Engineer, or IT Manager. This is absolutely disgusting. This entire experience has taught me a lot, and someone even suggested I lay a case of ***** and ******ion against MTN because each time we didn't want to pay the over billed amounts because we knew something wasn't right, they suspended our account. Those types of measures is referred to as ***** and ******ion. However, I have not done so yet. I really just want this issue resolved and for MTN to quit messing with our account.