Paying more than what I agreed to

I was phoned by Elite Mobile to upgrade my sim only contract on 21 November 2023. We agreed on a package and at the end of the call we ran through everything with the "Manager". Confirmed everything that I agreed to.All seemed fine until I phoned Vodacom to confirm what will be deducted next month. It was significantly more. I phoned Elite Mobile many times and they promised a credit on my account. Nothing till this day. They did an "Audit on the initial call" and says according to them nothing wrong from their side... I feel ****med and unhappy. I was blatantly **** to.