No response to multiple requests

I signed up for a pay as you go special with telkom in 2014 which included adsl and line rental. In October 2014 I was offered a better deal on the ADSL and submitted a request to cancel the ADSL and retain the line rental with Telkom. I received a call nearly a month later to confirm the update will be made. To date I am still being bil**** for both ADSL and the line rental. I continued to pay both amounts while sending several requests advising that I had submitted a request to remove the ADSL portion. In March 2015 I decided to withhold payment until the issue got resolved. Since then I have spoken with two people who confirmed that they could see my requests and lodged a credit on my behalf for the extra funds I had paid. However I am still getting billed for both the ADSL and Line rental, receiving threatening letters despite my requests being unanswered and have had my line suspended since May/ June, so I am also paying Mweb for a service I can't use. <br> <br> What I thought was a simple request has become a complete nightmare. This is my last shot at communicating with Telkom before I engage with a lawyer to try and get assistance legally.