Given false info on upgrade

I have been a customer with Vodacom since forever & never had any issues with them until now. I received a call from the online department to upgrade my contract which I was considering but they never had stock of the Iphone I wanted. This call center agent told me if I upgrade I will have the same package as previous which was 400min & I was getting 500megs data(I added extra data to this package) & sms's , I didn't bother with the sms because I never use that. He told me that I would be getting 400mins , 3gigs data & the sms's & that I would be paying less every month..... so I thought okay this is a good deal & then I asked him would this be over 24 months & he said yes. He then said when the call was almost done that he is throwing in a Hisense phone which it will be delivered. I received the device a few days later & then I phoned to enquire bout it & asked for my bill so that I see what was happening on my account to which this agent told me I have to wait till month end to see my statement.... remember I was called end of February 2022 to renew my contract & I received the contract via email on the 2nd of April 2022 & saw that I'm not getting what this agent promised me on my contract... on the contract stated 200mins & 3 gigs data & its over 36 months!!!! the only truth in this was the 3gigs..... I don't ever renew my contracts over a 36 month period.. He downgraded my mins when I specifically told him I changed it because 200 mins is a little & I changed it especially to 400mins so why would I downgrade like this???????? I phoned on two occasions to cancel this contract to which I was informed by two other call center agents I shouldn't they will get this agent to call me back & fix the issue. Guess what I never received a call back & then I ended up calling them again & I was told they would logged this enquiry & will get someone to collect the device. A few days later still nothing .... I called the online department again & spoke to a Nicolette & she informed me the person that did my upgrade no longer works for Vodacom...he resigned. I was told by her that she would get a manger to call me back as they dont have access to the calls to listen to it ...... no call back as usual. I phoned now again 04 May 2022 to which I was told the managers are in a meeting & the have sent another request for them to call me back.....STILL NO CALL BACK!!!!!!!! so how am I supposed to resolve this matter???????? I want to cancel this contract & nobody can assist me & telling me its 2 months into the contract which isn't MY FAULT ..... I have already paid one month of this contract which isn't much less than what I was paying before!!!!! I HAVE BEEN ENQUIRING ABOUT THIS SINCE THE UPGRADE WAS DONE!!!!!!!!! its pathetic how nobody can assist me in resolving this matter but they are so quick to upgrade the contracts ! IM EXTREMELY DISAPPOINTED!