False information for Contracting

I upgrade my contract through the retention department at Bytes, where I was supposed to pay R1280pm for a iPhone 11 Pro, with 300 minutes and 3gb of data per month. This was then changed by Vodacom, without my knowledge and two different insurance products were added(without my consent) with two sets of data, making my bill R1347. I am being sent between the Vodacom call centre and Bytes, without resolution. If Vodacom cannot fulfill what was initially sold to me, how do I get the contract cancelled? I have been waiting for a call for a Manager for two days.