BAD SERVICE, MISLEADING CLIENTS

I'm officially done with Vodacom. I received a call a month ago from a sales person for a top up offering, in the call he guaranteed me that there will be no addition fees. This month to my surprise and addition amount was added to my bill to make matters worse the cancellation i requested on one of my contact 2 months ago was not cancelled. I no longer own that phone or the sim card, yet i'm paying for it. I was on the line with the cancellations dept, the line got cut and they still didn't call me back. Why do i have to constantly call after them for their incompetence. I've been a customer for over a decade and this is the pathetic service i get from them. I will stop my debit order maybe that will get the attention.