Disgusting and Unacceptable Service from Telkom!

I cancelled the Telkom line service using their online facility 9 months ago as I was moving to a different area and i no longer required the line. I received email confirmation that the cancellation was in progress. I have been receiving monthly accounts for this service ever since, which have been mounting up, as they obviously didn't cancel it on their side, even though I had been in telephonic contact with them twice in this regard, and both time they assured me that someone from cancellations/accounts would be phoning me back to resolve this matter To date, absolutely nothing has happened and i am still receiving a monthly account for the line rental which is collecting interest. I owe absolutely nothing to Telkom and they still insist on sending me this account which is unacceptable, and i need resolution on this now!