Flipkart — Used phone given by flipkart

I bought brand new phone infinix zero 5g 2023 at no cost emi offer from flipkart and it was open box delivery and the delivery boy was open it and take otp fast and went immediately i don't have much time to see phone then I come at my place and see the phone properly check it then i saw there are some scratches on the screen without any touch or use. How is it possible? I felt cheated and i call flipkart they denied and no response from flipkart. What i do? I want new phone by replacement. Plz help me