Vodacom - Incorrectly billing

I have taken an upgrade in the middle of August 15, in the beginning of September i was billed extra for BIS because before the upgrade i had a blackberry mobile. The Customer service consultant after been transferred from pillar to post say he cant help me i need to go to the store. the store says i must call customer care as i dont have a blackberry but is been charged for BIS. Why should i pay for a service where i dont use the function. The consultant at time of upgrade was supposed to cancel the BIS. He did not do that and now im paying for it and no one wants to assist me. I have been a loyal customer of vodacom for the past 8 years or so and i am very disappointed in the service. Outcome after my call to customer service was a reference number to say someone will call me back. All i want is my BIS to be cancelled and a credit for that charge. But customer service cant not do that so well who can do it. Be careful people of Vodacom. Because customer service is not for customers.