Inflating my bill!!!!

On Sunday 6th December, I received an SMS saying I had run out of data... I proceeded to check my online account which was updated and my bill was sitting in the region of R460. (My approx monthly charges) I then purchased a 3Gig bundle for R299 - proceeding to increase my bill to the region of R760. I was smsed straight after saying it had been activated. Today, Tuesday 8th December I decided to check my online balance and although I have not sent any mmses, I still have 2.71gigs of data, 64 anytime minutes and 475 smses, somehow my bill has now increased to R1024.83... So somehow I have been charged UNfAIRLY for some sort of services in the range of R265 which I should NOT have been charged for considering I still have data, minutes and smses available! Last month was bill was also about R250-R300 more than usual. And I have been hearing so many stories how vodacom is just charging people for unused data. My contract is coming to an end and it would like to renew it so it would be appreciated if this could be refunded and sorted out IMMEDiATLY!! I am a long standing and loyal customer from vodacom and I don't expect to be ****** blind like this!!!!!