Still getting account after line was cancelled

I'm still getting an account after I have requested on 2 occasions for the line to be discontinued as I have moved address. I have a recorded call which I have made to Telkom to state that I will move on 30 March 2015 and that the line should be discontinued at the current address. The line is now still active and I'm still getting an account. I will not be responsible for that account and for any calls that is made from that line because I did notify Telkom that I'm moving to another address and that the line should be discontinued on 30 March 2015. I also have a voice recording of this. I also did speak to another consultant at the call centre which also assured me that the line will be discontinued but the line is still active and I'm still getting an account. The account should be reversed (credited) and the line should be discontinued!!