Telkom trying to ***** out money

Went in-store to cancel of my account , and was asked for my ID and the 30day process of cancellation, which I had agreed to which was last year October , they didn't debit me again, not until 3 months ago taking out insane amounts of money from my account, only for me to then call my bank and do a reverse ,and in turn paying R40 every time I do that, this is ********** behaviour and Telkom needs to start doing things the right way and stop trying to ***** ppls money!!!