Telkom just don't care

In September this year (2017) I have given Telkom written notice to cancel my line on the last day of October 2017 as I was moving to a new location. I have completed and signed their required form and emailed to the correct address along with all the required documents. After 21 days I have heard nothing from them so I decided to phone them. The lady I spoke to said that my line was still in use by MWEB (My ADSL line was with them) and they could not cancel it (but they also didn't let me know). This I understood, so I went back to MWEB and after a few days they phoned me back and confirmed the line was cancelled on their side so Telkom can proceed to cancel the line. I emailed them the request (along with all the required documentation) again and after a week has gone by I received an email saying that I need to fill in the form and resend it (I have no idea why as there was nothing wrong with the form). After the third email and the line still not cancelled, I got very frustrated. I contacted their call centre and asked to speak to a supervisor. I was told all the supervisors were in training and they will call me back as soon as they get out. I did not hear from them for 2 days, so I phoned again and requested to speak to a supervisor. I have done this 3 times now and have had no luck. I pay them via EFT (not debit order) and decided that I actually just don't care either. Had a credit on the account which they should have paid me, but instead they delayed the process so much that I end having to pay them now for a line that I'm not using. I will not pay them and I actually don't care if I get a bad credit record. I will go out of my way to avoid using Telkom EVERY AGAIN even if it means paying 3 times as much for my internet connection. I will also go out of my way spreading the news of how terrible they really are. I have also had numerous bad experiences with them in the past and endless ADSL problems (which was confirmed to be on their side). Telkom - I really hope your clients start to treat you the way you treat them. The worst service I have received from any provider ever.