Account cancelled but still receiving invoices

I cancelled my account on 13 July - I sent the email 3 times due to no response from Telkom. I tried calling and was informed that one has to go the email route and cannot cancel over the phone and that they had no way of telling me whether they have received the cancellation. I finally received a call to verify my cancellation 3 weeks later. In August, I received an account which I paid assuming it will be the last one. In September I received another account for the line. Upon enquiry I was asked whether I cancelled my line as well as my uncapped internet. I sent the lady my cancellation form as proof. No response. I asked for feedback a week later. No response. This month I received a bill once again for both the line and the uncapped internet. WHICH I AM NOT USING SINCE I HAVE MOVED. Telkom is robbing me.