Please Help Cancel my Line.

Sometime in November last year(2014) i requested telkom to cancel my line which was not working after several attempts to fix it by telkom technicians. I have been to Festival Mall several times and have been complaining to them about them billing me every month for a line that is not working and that is in the process of being cancelled. But up to now i am stil being billed for that line and telkom is taking my money through a stop-order facility.I have escalated this matter to the OPS Manager in Pretoria, responsible for Disputes in the Gauteng region, a month ago, but my issue has not been finalised yet.Please help.