Account *****

I have a contract with vodacom for an iPad mini. i pay R305 monthly but the past two months vodacom has been debbiting R750 from my account without a reason. My contract ends in May 2016, this is their way of making money from me. It's not the first time vodacom commits such ***** against me, last year I spent two months receiving data, but they took money from my account, now that my contract is about to end, vodacom needs to make more money from me.