Bad service

I have been struggling for two months to cancel one of my contracts even though I had paid the penalty. The debit order for October was more than my statement amount. I call the call centre and requested to speak to a manager. A gentleman named Gibert came on the line and stated he was a team leader. I explain my problem and he informed me that the number I was cancelling was cancelled. We went through all my numbers to understand why more was deducted. He informed me that I had an additional number. He asked if he could investigate and call me back with more details as I requested proof that I had taken this additional service. That was three days ago and I have had no call back. I am so tired of vodacom and their bad service.