MTN have messed it up ... AGAIN!

On 26th July I posted a review re the fact that my contract renewal had not been updated correctly. I was very excited when Jessica from MTN told me that the issue had been resolved. I have just opened my statement and it has NOT been resolved. Plus a supposed credit for previous months has been offset by a debit for that amount. What is that?! It's a mess and I am at my wits end. They just beat the fight out of you so that eventually you give up and pay for services that you are not receiving. Can the NCC help me get this contract cancelled.