Cannot cancel Telkom subscription

I have been trying for the past 2 months to cancel my Telkom mobile/8ta contract to no avail. I have been told by various Telkom representatives to use various methods to cancel my subscription. I have called the callcentre and the automated voice directed me to do this online. I have spoken to a Telkom rep and was told to use the Telkom app to cancel and the app does not move past the login screen. I have 2 days ago gone into the Telkom store at Liberty Mall and was told by a friendly Telkom representative to go online using a link he gave me. I still cannot move past login and the system cannot retrieve my information. I am at my wits end. I am being charged to this service and it seems impossible to cancel as I am always being directed to faulty technology and no human at Telkom can help me