Cancelling a Vodacom expired contract is a nightmare

I got into a 24 months contract in 2018-04 which was due to end in 2020-04.I did not upgrade but went on a month to month which was explained by the agent before taking the contract. Now in 2021 when I want to cancel the contract I'm told that I can only cancel in 2022 as the contract only ends in 2022 else I will be charged cancelation fees. They say my contract was upgraded of which I did not do. When I ask who upgraded the contract and who confirmed the upgrade they dont say. I stayed on a call for an hour being told that I was getting transferred to another department only to restart the process with another agent.