Headache cancelling ADSL and Voice Services

On the 3rd of May I cancelled my ADSL as well as voice line with reference number ********** 758 : ********** but continue to get billed for my services. I called the call center 3 times. Spoke to Seviwe in billing as well as Nokokanya, but no hoy. I visited the Telkom shop in Tygervalley and was promised by Carrie that she would follow this up. I have to date not heard from anyone. I now have an outstanding invoice against my name which I am not liable for. Please cancel my services with immediate effect and remove any outstanding invoices.