Vodacom refused to do a Premature Cancellation

I did a Premature Cancellation on 19/4/2018 and paid the amount of R261-27. I did this in the Vodacom Shop ********** When I received my monthly invoice I saw that the contract has not been cancelled. This was on 20/5/2018. I went back to the Store and I was informed that the store is not there for the public to cancel contracts and that I did me a huge favor by taking my money for the cancellation. Odette at the Vodacom shop was not helpfull and she said she could not assist me. I contacted Vodacom Customer Care and I was informed that this is between me and the Store why my contract was not cancelled. I still keep on paying for a contract should have been cancelled on 19/04/2018. I need assistance in getting my contract cancelled and the whole subscription for May and June needs to be credited to my account. To all the customers, PLEASE MAKE SURE THAT YOUR CONTRACT IS CANCELLED when you do a premature Cancellation. I can not wait for all my contracts to expire and end all business with Vodacom.