Contract cancelation

I made contract with vodacom in 2021 and the contract ended in 2024,they said am in areas i paid hem R900.I asked for the contract to be cancelled they said i must wait a month then i called they saidni owe R1012. I need to pay before i cancell which was in July 2025 and called for cancellation.Then now today they say i owe R701. For what.dont try and take contract with vodacom.I work for my money hard.Mind you am not using their simcard.Am tired of this.