Phone 5 months old I want a new one not sent in or repaired

My wife and I upgraded our phones at the tygervalley branch 5 months ago to the iPhone 12 mini , my wife has had constant signal issues with the phone and 3 days ago the rear camera and flash stopped working a online diagnostic was run from Apple inc and they couldn’t pick up the rear camera , so I went in to the store and was explaining and was basicaly brushed off by the tech there , saying I must go to canal walk and they can repair it there , now I don’t want the phone repaired it’s a expensive phone , 5 months old I want the device replaced I don’t want further issues down the line , the service I was given was shocking I have so many Apple products and to get that service I Honestly feel I got a **** product , clearly after service is not a thing , tgis phone is my wife’s buis phone and tge o my way I get to see my new born son when I’m back at work , I want to go in there with a lawyer and do a consumer claims act , I want my wife’s phone replaced and replaced by the guy that brushed me off the phone was purchased at the tygervalley store , look forward to response