Vodacom's ********* behaviour

In January I phoned Vodacom to cancel one of my contracts, this after I was ******* into believing that the contract is only expiring later in the year. I cancelled both the upgrade and the contract and found out that the contract was terminating end of January and not later in the year as I was told.. I am still being charged for the contract. I phoned Vodacom this morning to find out why I am still being charged, to be told that the contract was never cancelled. I just received an SMS from Vodacom to tell me that the contract has been converted to prepaid. What do I need to do to get the contract cancelled and get refunds for February and March for paying for a contract that I cancelled in January?

I must say that I find Vodacom's way of doing business as ********* in the way that they trick customers to do upgrades , as well as not cancelling contracts and expect the customer to pay for service not received. This is the second time that Vodacom has done this to me. Definitely not a company that I would recommend.