Telkom Bad service

Good day. I need help please. I have a Telkom line with ADSL with Telkom and the last few months I am having serious problems with slow or no internet service at all. A fault has been logged on 5/12/2017 and up to now nothing was done not even a phone call to tell me what is happening. I want to cancel my service with Telkom but I just hold on for 20 min to the customer line with no one answering. I want to go wireless and just want to cancel my current line and ADSL. They don't have to repair I want it cancelled. Could you maybe assist me. Thank you.