Being Over Billed For 1 Year - 3 Months No Fix

Telskum has been over billing me for almost 1 year and since inception. I logged a complaint at westwood mall on 1 Nov 2015. The agent Sean advised that Telkom will be in touch and resolve. He advised that the promo discount was never added to my account and that I've been billed incorrectly since inception. It's been 3 months and I have not had any feedback nor resolution !! An indefinate reference no is not a solution. This is absolutely pathetic and can be considered *****ing ! I demand my monies returned to me immediately along with an obligation free & zero penalty cancellation !