Hey there and welcome to the Samsung UK and EU Community Customer to Customer Forum
Sorry to hear of your issues. In this reply I'm assuming you are in the UK and bought your device from a UK retailer (not Amazon or eBay).
If your device is brand new and you are inside your cooling off period, I would go back to your retailer and request a replacement (if you're inside your cooling off period, don't be fobbed off with an offer of a repair).
If you are outside of your cooling off period (typically 14 days from date of receipt of device) then go back to your retailer and request a repair. (Some retailers may offer a replacement but they are under no requirement to do so, it would only be their goodwill).
S24 Ultra
