Ending of a contract

I've been trying to cancel my stupid contract for months. The first time I was to early to cancel. .a month before the end I phoned in again and asked to can-cell which they did 'so i thought. Got the bill and thought that's the last. The next month I got another bill.I called nd they said it's not cancelled. I cancelled and said that the phone is not in use. <br> Once again I got another bill. Called again and spoke to a Zukiswa. Got a ref number nd she put me through to cancellation dep,which I might add was closed. Do they not know that. <br> Then I called again. Nd the said the manager will call me. Have a ref number. ***)it's been week nd a half and still no call. I left my contact number because the cell c number does not work.so one again another bill for not using there services<br> What do I have to do.<br>