Telkom refuses to cancel the ADSL line

I have been requesting Telkom to cancel number *** from 28 February 2015 till now, but they just point blank refuse to cancel it. When you phone Telkom they tell you you must e-mail it to [Email Removed] or fax it to ***, and they will send back a reference number, but I have been faxing and e-mailing over and over, and I get no response from Telkom. Then I phone to complain, and they tell me the only way to cancel the line if through the e-mail or fax, they can't do it over the phone, so the line doesnt get cancelled, and we are still getting bills. So you can't cancel a line, they just force you to keep the line, and force bills on you, to me this is *****