Misinformed of contracts available - I want the contract changed or cancel the deal!

I was upsold a Samsung contract without being informed of the other options. My delivery came without the smart watch and i was told that it included the watch. I now want to cancel the contract because of this pathetic service and now I am told by Pinky Luthuli to take the phone to MTN myself and tell them I want to cancel? I want this deal cancelled by Mondo. I will not drive to an MTN store. This phone was delivered to me so surely it can be collected. I want this matter resolved today! If you cannot change my contract to the Mega Gig S (4GB 50min) and have the smar****ch delivered to me, then I do not want this contract

here is the deal that I was not informed about when the contract was sold to me.

https://www.mtn.co.za/shop/deals/device/samsung/galaxy-s23-ultra-256gb/1-E9CJCGXLP