Incorrect Billing & No Customer Service

MTN have over billed me yet again.... On 10 July I wrote my first complaint - this after a few months of back and forth to staff at head office. On 28 July someone responded saying they will contact me to sort this out. I think MTN only respond to appear that they have some sort of customer care, because that phone call never came. Now, 2 reports later, lets see if someone will take accountability and call me back. My contract billing should be R800 per month. I am billed R1 500 plus every month!! Every month I have to fight to get it fixed and every month it comes back incorrect. Now I am told I am going over my data allowance (which is impossible) and a cap was put on... low and behold... with the cap I am still being triple billed for data bundles! What a disappointment MTN! Can someone please fix this, it is exhausting!!!! Unhappy customer that would move if I could.... :(