DATA USAGE

Since renewing my contract in Jan 2014 I've received exuberant bills for data usage. On querying the account vodacom converted the data usage to data bundles thus resulting in a normal cell phone bill. I then requested that the change my contract to the cheapest contract available for this handset as I advised them I cannot afford these bills for high data usage. My request was please change to a top up contract as I will buy airtime/data as I can afford as this phone is with my son and I don's know how much time he is spending on the internet. Things was fine for a few months but then all of a sudden in Oct-Dec 2014 I once again received these very high data bills. As far as I was concerned I've asked for a change in contract restricting the user access to internet once the available amount is used and was shocked to once again receive this very high bills. I continued paying the normal account that I was aware of every month and even some of the data bill. However since they've blocked my line I feel It is unfair to expect of me to pay for a service I'm not getting and stopped paying the account in August 2015. Vodacom further invaded my privacy by contacting my friends