Vodacom

I have a cellphone contract with Vodacom and my contract was suppose to come to an end on the 29th of April. I called Vodacom to try and end the contract. I have been struggling to end the contract as I kept being told by customer service consultants that I need to call on a month end. To my surprise I got an invoice today that showed that I need to pay R294.04, I've been paying R195.00 previously and all of a sudden there's is an extra R100.00 that I'm charged. When I contact Vodacom about this, I'm being told that I bought data which I never did. I don't even get the data that I supposedly bought. All I want to do is cancel the contract and have that extra R100.00 reversed. I will never ever take up another Vodacom contract for as long as I live.