Refusing my cancellation request

I have a data contract and a cellphone contract. My data contract is die to be cancelled end of December 2025. When I called to request the cancellation of the contract their reactions advisers (plural) refused to accept my request and kept saying I should take a different contract. With an immense struggle I eventually got confirmation that my contract will be cancelled. Later that day a sales staff called me and said I WILL be upgraded on my cellphone contract, after I advises I will soon make my cellphone prepaid the sales staff dropped the phone in my ear. I lodged a complaint and there is still no feedback. I dealt with way too many rude people now at Vodacom, will ever return to them again