Cancelled service still being billed

On the 4 of November 2015 my telkom adsl line was installed, it was faulty since installation. After various calls to telkom and calls logged to their technicians my line was still faulty by the 4th of December.<br> <br> In the mean time I was being billed for this faulty line. I then cancelled my line on the 4th of December, filled in the cancellation form and got a response back that cancellations take 5 working days to be processed. I resent my cancellation form at the end of December as a Technician pitched up at my home without an appointment to repair the line. I told him to leave as the service was cancelled. I Then received another bill at the end of December and end of Jan.<br> <br> Today the 17th of Feb I Received yet another bill for this faulty and cancelled service. Please explain that to me.