Billing but no service

We haven't received service for four months now but Telkom has been billing us for the past two months for who knows what? We tried over and over again to get our line moved but to no avail. So for four months now since we moved, they have failed to move our line and today I received an invoice for R3 448.27?? I contacted them last month twice on the phone to sort it out, but nothing has been done, I have only been SMS'd a reference number.

They are trying to debit my account each month, so I have to ensure that the funds are not available but then there are bank charges for that. Nothing gets done. I wait for at least ten minutes per phone call for them to even pick up but just get given a reference number each time. Can no one help me?