Beyond frustrated!

We have been struggling for over a year to cancel a 3g contract with Telkom. They sent us the device knowing we don't have reception in our area. We sent it back immediately, in keeping with their agreement that a contract will be cancelled if the product is returned within 5days. But still they are taking R149 a month from our bank account. I have reported this to them more than 10 times and every time they tell me my request has been escalated to cancellations department and someone will contact me in 7 days. No one ever phones me back. We have an adsl line contract with Telkom and we pay for that every month as we agreed to. We keep our side of the promise, but Telkom does not keep their promises. I just wish we could talk to someone that can ACTUALLY REALLY help us! Not just another call agent!