Refusal to process a legitimate vodacom cancellation

Yesterday 2 October 2023 I upgraded my contract at Vodacom Cresta. I asked if I could cancel two other numbers and was advised that I would have to phone Vodacom. In spite of being in possession of a written contract, the operator insisted that I had upgraded two other numbers which is untrue. Vodacom is trying to mess me around to avoid a legitimate request for cancellation.