Cancellation of contract

I called the mtn call centre on 07/05 as I was told to do on a previous call I had made to the call centre to cancel my contract and convert my number to prepaid and received a reference ***. The cancellation was not done because of the strike at mtn. I realized that it was not converted to prepaid on the 20/05 when the contract airtime and data bundle was loaded. I tried calling the contact center but I couldn't get through because of the strike. I emailed Mtn's customer services and my number was only converted to prepaid in July. I was now billed for the extra month that the contract went on for. When I called the call centre to query this I was advised of the above and asked that someone call me to have this sorted out and the amount for the extra month of the contract to be returned but no one has called me since ***. This just goes to show how much you'll care about customer service. I was thinking for taking another contract with MTN but after this I don't think I will. I want the amount that was billed for the extra month to be returned. I did what I needed to do to have the contract cancelled in time. I want this sorted out asap.