What does it take to Cancel Service with Telkom

what does it take to cancel a landline and ADSL line with telkom??? I am emigrating and have already moved out of my house. I submitted all docs on 29th January 2018 and received an automated reply the same day. since then nothing has happened. I have spoken to a couple of very nice ladies on 10210 who have promised to escalate the cancellation for me and supp**** me with ref numbers but to no avail. I went to Telkom Direct in Adderely Street only to be told that they do not deal with cancellations and to use the call centre. I have just used the chat line on the website and again forwarded all my docs. I am still being billed, with interest, for a service I do not want and am not using. I know I am not the only one in this predicament but seriously what does it take to get something done. this is an ongoing problem I would like to resolve before I leave. this is a disgrace and total waste of time. another industry that couldn't care less.