Poor service on request for cancellation

This is the third complaint I have placed regarding poor service from Telkom on refusal to cancel a contract.<br> The only response I have had is a request for completion of the cancellation form, which was done and received by Telkom in October 2015. Telkom is still sending invoices!! What more do they need to act on their own cancellation form?<br> I have lodged a formal complaint at both the National and Provincial Consumer Commission.