Wrong information given when cancelling a contract

On the 1st of November I phoned Vodacom to cancel my contract spoke to a lady by the name of Jessica and she told me my contract has been migrated to Pre paid and on the 1st of December 2022 and on the 1st of January 2023 only R70 will be deducted of my account, after asking Her twice Jessica is that the only amount that will be deducted of my account and she confirmed yes. On the 1st December the normal amount of R355 was deducted so I then phoned Vodacom again and I spoke to Jennifer and asked her to ask Jessica to phone me and then later that day I spoke Jessica again she then told me the contract is now cancelled and nothing else will be deducted. On the 30th of December I phoned again and spoke to Lerato and she told me that R220 will be deducted again after what Jessica told me. This is really unacceptable and also I was given the wrong information,also spoke to Ayanda and she told me that it was very easy. Jessica just needed to check as there was a early cancellation fee and just given me the right information. As I spoke to people I'm not the first person that struggles with Vodacom to cancel a contract.