Over billing

I have a contract with Telkom and for 3 months I was debited over R2800 and I've been calling 180 which is their customer care with no luck of finding answers instead the consultants will tell me that they don't have answers for my questions. Yesterday I received an SMS from Telkom saying my case has been resolved and they stated one of the 3 reference numbers I have from them. I called their customer care and was told that only R202 of the rejection fee was reversed and my question is why only R202 as I was charged rejection fee for 3 months plus a lot of amounts that was brought forward which not only me don't understand even the consultants cannot explain in detail what that means. To my understanding I was supposed to be changed R486.39 for mid August and September R269 for October R269 for November which in total should be R1 024.39 however what I have been changed from August to November is R2 712.68 R486.39 August/September R363.89 October R943.40 and R919 November And on top of that I still have to pay R743 for December. Can I get answers now as I'm loosing my trust in Telkom.