Struggling to cancel contract

I called Vodacom to cancel my contract.I was told that it is in areas so I cannot cancel.I told them this has already lapsed how can I be in arrears.Agent told me my contract came out with Nokia phone and was taken in Feb 2022. The contract I want to cancel is a sim only contract that was taken over 24 months.When I initially took the contract in around 2018 yes it was for Nokia phone but I am told about even in 2023.no wonder why they have been recently fined a millions.I just want to cancel this sim contract that was never used...PLEASES PLEASE PLEASE