MTN Account suspended unfairly

MTN has again suspended my account, because they fail to do proper billing. Their system seems to remove my account discounts and then I get billed the wrong amount. I paid the correct amount - contract agreed amount - but got suspended anyway. I reported this on 9 November after my account was suspended. The suspension was then reversed, but today - THE SAME THING. I had similar issues a year ago to date, which took 5 months to resolve. I had enough with incompetence, I really wish I was with Vodacom as MTN has no clue.