Dissappointed in Telkom

I had taken out a wifi modem from Telkom paying monthly R147 for 10gigs anytime data per month. For the past few months I had to phone in to telkom and remind them to load my 10gigs. The past 2 months Telkom deducted money out of my account without loading my 10gigs. I have phoned in numerous times even recieving a reference number. I went to N1city mall Telkom branch to lay a complaint too but all they said is that i must wait for the investigation to be completed and they will contact me. I also ask then why does telkom deduct still from my account and not loading what is due to me. This is pure white collar crime in its true form. I am sidelined as no one can assist me. I can cancel the contract but then im still liable for my remainding months as they say. So its the same thing. DISSAPPOINTED AND DISGUSTED. Where else can I lay a formal complaint as i cannot see it go on for another month. PLEASE ASSIST. O.DAVIDS