Telkom in Breach of Contract and Still Billing Me

I have not had any service from Telkom on my LTE data contract for over a month now. After many calls to their call center, they were not able to explain why the service has stopped working. Since I have not had service for over a month, I went to a Telkom store and completed the cancellation forms. The agent there assured me that the account would be cancelled immediately. I see that Telkom deducted another months service fees even-tough they are in Breach and I have cancelled my contract. I will never use this company ever again !!!!!!