Impossible to cancel a landline

<p>A month ago I sent Telkom the required cancellation form for my landline and despite sending it to them another 14 times I have yet to get a response. Every time I try their chat line they tell me to contact my ISP to cancel and disconnect me. My ISp (mweb) cancelled the adsl line the same day i asked them to. How on earth do I get them to cancel and do I have to keep paying for the line( not in use) wile they ignore me?</p>