BAD SERVICE - SAMSUNG

I bought a new Samsung J4 Core Smartphone Black at Game stores on the 26 August 2020 and on Sunday the 13th September 2020 the screen just turned white. I have a protector screen over and the phone is 3 weeks old not even really been used for anything. I took the phone to Game store, Paarl and advised them of the problem the next thing the phone needs to be booked in for repair. How do you repair a brand new phone. I said to the lady (not a nice and friendly person) to ask for assessment only as this is still a new phone and the consumer act states that if found fault which there is otherwise it would of switch on and not stuck on the power and restart screen. She said that it is repair and my reply to her the phone is still brand new why should I have it repaired if not even a month old. I am so so disappointed in Samsung and want a new phone. My third day without a cellphone at work. I do not have any cellphone and had to buy a cheap phone where I can only take calls on as I cannot afford to buy another smart phone now. So Samsung what are you gonna do I need my phone back urgently.