Telkom sucks

So once again I have an issue with telkom. My LTE contract has ended in February 2018 and I have been trying to cancel it ever since but to no avail. I have sent in my cancellation forms to so many different email addresses but nobody ever replies. I have called in to the call Centre a number of times as well and complained about this then they keep telling me I can cancel online as well. So then I follow the promps to cancel online and just when I get to the end it says an error occurred and an agent will call me back. And guess what... not a single call from telkom but I guess I was dreaming by thinking they would call me back... what a joke!!! They are so quick to call you when they want you to sign up but dare you try and cancel... so I have been billed for the past few months and I refuse to pay it. Is there perhaps someone that can help me cancel this contract? They are so quick to hand you over to lawyers for non payment but is it possible that I can hand them over to lawyers for not allowing me to cancel lol... so frustrated with them!!!