Bad Device Sold

Went in for a new business contract, device already in mind - Samsung S24 Representative started making the brand off as not good any more, convinced us to take a Oppo Reno 10+ Pro. Before receiving the Oppo we did advise that we rather want to go for the Samsung, she made the change as if its a huge thing, due to time and its for business we went on with the Oppo, upon their recommendations. We did say that if the device is not Satisfactory we will come back. Now we are not happy, a 36 months contract which the network is not a problem but the device we are not happy, within 14 days of receiving it. The branch manager simply say its one of those things, not willing to assist. We don't want to cancel the contract, we want the device changed as the Oppo is ****. We are not happy with this device. On top of all we were told to receive the matching watch in 7 days, needless to say, no watch from Oppo.