Dissatisfied with the way Telkom handled my compla

I had a contract with Telkom which ended in September 2013. In December 2014 I was told to pay R341.00 because the contract had not been cancelled. I then made the payment and received confirmation that the account was paid up. 17 months later I have received an email that my account has been handed over for legal collection and the balance is now R936.22. I have made several calls to Telkom but not getting any joy from them. I have not been using the phone or airtime that was supposed to come with the said contract yet Telkom continues to bill me for services I do not have.