BBM service

I am currently getting a message from vodacom stating that I have renewed my BBM service. I have an iPhone and do not have a black berry! My iPhone was purchased cash from the Apple Store and my contract at vodacom is for a couple of rands of airtime and a data bundle! None of which is blackberry related! Yet every month I recieve a automatic message saying, "Thank you - You have been allocated the Monthly BB10 BBM(200MB BBM). Your service has been extended until 01/06/2016." I have gone into the vodacom stores and even made an enquiry on their face book page and still not response or assistance. I'm really upset with vodacom as I have been receiving this message for more than a year and have no other option but to ask for assistance else where! Please can you help :)