Telkom mobile billing me extra, again!

Telkom has been charging me for the unlimited calls to Telkom mobile, yet this supposed to be free for the first 12 months, i call them to reverse the transactions. They finally did, and then again they repeat it the next month yet i have been told that this issue would be solved. I called customer care and they said they have sorted it out and i wont be charged for the month of November. Yet they still charged me! even though they said the issue has been resolved. Now i got my billing for December i see that the extra charges are still on my statement. This is ridiculous, how long does it take to sort out one simple issue. I cant keep calling every month and explaining to people who don't even know how to help me. Really disappointing service from Telkom mobile, no one knows what they are doing when they try to resolve my billing issue. I never had this issue with MTN, i rather move back once my contract is over.