Vodacom cancellation

I phoned vodacom on 26 October 2020 to cancel the line that i use for my router. The consultant Angela told me that the line would end end of November 2020. I received an invoice today for an amount higher then what i used to pay. When i phoned the agent Itumeleng advised me that the line will only be cancelled on the 27 December because there were no cancellation logged. I need this to be sorted out now!!!!