incorrectly billed for the past 3 months since i took up the contract

This serves as an official complaint about Telkom mobile’s Fourways Mall branch inconsistent and breach of contract conduct. When I took a contract in September 2017, I communicated clearly that I wanted a capped package and that was also on the contract. After the first month which was end of October 2017, I noted that the balance sent to me was far higher than what I understood to be my monthly contract fee. I then went to the Telkom Fourways branch and confronted them about the matter. Upon which I was told the amount would be capped to what I had signed up for. The following month November 2017, the same happened when I was billed a much higher monthly fee and when i followed up again I was told that I had logged the complaint only in November and thus the account will be capped only from December 2017 going forward. Here I was duped into a contract where I’m paying almost 3 times the contract amount that I signed up for. My monthly bill as per contract is R550 but I am being billed R1500 this month after i specifically went to Telkom and instructed them to cap my account to R550. This is unacceptable when I have taken every measure to inform Telkom to keep my account limit to the agreed upon contract fee as advertised on their brochure before I took up the contract.