2 Months and still no help/feedback/ resolution

I have taken a new data contract out in April after lots of complaining. Eventually the contract was finalized however I am being billed incorrectly. The data contract was some R700 for 120G I have being charged almost R3000.00. The usual I have sent emails, called and even went back to the VERY HELPFUL FAirland MTN shop who just keeps ending emails not helping at all. I have opted to change my DR order to manual payment so that I pay what o took out for howver if the billing is not sorted and I reach my Cr Limit my number will be suspended and IM sure my credit rating affected. I have previously logged adispute on Hello Peter and the consultant closed it saying it is being looked it - almost 2 months not sure what has been looked at. I need the account and billing to be rectified or else MTN needs to credit me and cancel the data contract all together. Hard to believe that the basics are so hard to get right? Does everything have to be such a tideous process ?