False Billing

I logged a call with Telkom 3 months ago to fix my adsl, the call was closed without sending a technician to my apartment. Towards the end of the 1st month I went to Telkom in Claremont Cape Town to report the incident, they claimed that my cell number has changed. It has not. I cancelled the service and paid for unused for the month. In the second month I received a statement with outstanding fee. I called Telkom's accounting department to ask about this amount. They promised to create a dispute because I had no service in the second month (notice period). Mid June I received another statement stating that I owe double the amount. At the end of the month (June - second month) Telkom charged me R600 an amount they promised to create a dispute for.