Canceling Telkom account frustration

I have canceled my wireless land-line on 17 April 2018 and have done this via phone, online, email and received an email and sms to confirm cancelation. Since then I have contacted them numerous times since I still get a bill. I was handed over to Nu Debt with threatening legal action if I don't pay my account. I have called, emailed and have numerous ref numbers but no seems to be able to do anything. I am tired of this and recommend anybody that states they want a Telkom line to stay as far away as possible. This is very frustrating since all I get when I call is a new ref number.