Cancelled contract, still being billed

I would have given them a 0 star if I had the option. In October 2020 I emailed the vodacom retentions/cancellations to cancel my contract that has ended. I got no response so I emailed again in January still mo response and in the mean time, I'm still getting billed for a contract and number that I don't use. In times such as this where every cent counts, this is unacceptable from a large telecommunications company loke Vodacom. I am terribly upset and need my contact caneclled and my bills amount since November last year to be reimbursed to me.