Incompetence is costing US clients too much money!

I am a very unhappy Vodacom customer and I am seriously considering buying out the contract and moving to Cell C. I upgraded my contract in April from a Blackberry to Samsung A5, the contract amount is R560 including insurance and now I am being debited R750!!! I call the call center to assist me with this so I can be compensated the agent cannot help me with this instead she says that I have been paying for BIS for the past 2 months- HOW CAN I PAY FOR BIS WHEN I USE A SAMSUNG... The only high amount I am aware of was supposed to have ended in May because that is when the blackberry contract ends but why now in June am I paying R 755 and for BIS that I haven't even been using. And I signed for my debits to go off on the 1st of every month why am I only getting debited today. Vodacom needs to catch a wake up call SERIOUSLY. I am very loyal to the brands that I consume and I expect excellent service! Not Happy!!