Telkom irregular billing

I had a data account with Telkom for R199.00 which lapsed after 2 years and they continued to bill me on a month to month. i advised them on numerous times that i wanted to cancel my account which fell on deaf ears. eventually I went to their shop in Eastrand mall where i cancelled and got a reference number. They are constantly deducting monies from my account claiming it was my final bill. i went to their shop in Eastgate and was told i need to pay a final bill. I am tired of these reversals on my account, can this irregular billing be stopped please before i report this to the national consumer commission!!