Cancellation ignored. Service billed for whole year.

It has been a few years now and nothing has been resolved. I had an ADSL connection, I had Afrihost as my ISP and I chose the package to have the ADSL line included in the price package which means Afrihost will manage my line. I do know that you need an active telephone line even if you are not using it that's why I paid R199 every month for a phone line I am not using as I only used the line for the ADSL, long story short. I got a good LTE deal and cancelled this ADSL service, please note that I sent this email to Telkom to cancel my service with them and they only cancelled my ADSL line and not the actual phone line. For months I was billed and complaint about this bill that it should be cancelled because I had no services with Telkom anymore. It came to a point that the account ran up too R2000 with nothing being done to cancel the line, surely the system should cancel a line automatically if it has not been in use for 30 or more days. There was literally nothing plugged into the wall socket but apparently Telkom felt the need to bill me every single month for something I do not use. This debt has been sold to 3 different debt collectors and is really f-ing up my credit profile. I will not be liable for your service desk that is ***********, I have sent you my cancellation and it was purely ignored. I want this sorted out ASAP as I can not go on with this any longer.