Incorrect pricing and information given.

My cell phone contract is expiring on the 15th Jan 2023. I received a call on 04th Jan 2023 to find out if I would like to upgrade to 5GIGS Day, 5 GIGS Night and an extra 5GIGS which will cost me R79.00 per month. I said its fine and I will keep the contract open. I then called Vodacom on to find out about the upgrade and was told by the person who assisted me that the amount given to me and the amount on the statement is not the same. I then requested that he cancel the deal. I spoke to another FOUR different people who could not help me. The last person I spoke to convinced me that he has sent through a request to cancel the contract and I will receive a Ref no (which I still have not received) to confirm the cancelation. I have had endless issues with Vodacom where they give you one amount over the phone and when you get billed its something else. THEIR SALES PEOPLE NEED TO BE TAUGHT NOT TO BULL **** THE CLIENTS OVER THE PHONE.