Cancellation of line

I am trying since May 2015 now to cancel my Telkom Line and it is still not done, I got a reference number 122499 promising that the cancellation is done and that they will reverse July's invoice after sending numerous faxes and emails with no joy obviously this was not done now Tabise from accounts promised me I wont hold on for cancellations she will put me through, I have been holding longer that 45 min now. I want this to be sorted!!!