Cant cancel or talk to billing!$

<p>I took a cancellation form to a telkom shop in Pietermaritzburg in December 2016. I moved to the Western Cape and got an adsl line. The first line was never cancelled and now they keep billing me for both lines and cutting me off. I have tried soeakubg to someone but they keep referring it to "billing" but you cant talk to billing. What a disaster. I need this for work!</p>