Paying for BIS on new iPhone contract

I suddenly discovered so many discrepancies on my Vodacom bills. As a customer with 7 contracts I was hoping that I would be saving money in the long run. However, I am paying for services I DO NO LONGER USE, e.g. BIS @ R59pm for the last 2 months. I upgraded 2 contracts with iPhone 4S handsets 2 months ago. Vodacom forgot to disable BIS or forgot to tell me to have it disabled, since it is very much useless with the iPhone. I am not keeping a close eye on my bill as I ALSO noticed I am paying double for a handset on one of my contracts. And calling the Call Centre, just frustrates me so much more!!!!!