"It's a new watch, why are you paying for a new screen? The screen prices are ridiculous.
Apple won't touch it now, you're on your own, you've voided your warranty.
You can't get copy Apple Watch screens, they use OLED, not lcd, OLED hasn't been copied, and I doubt it will, not for an extremely long time anyway, the Chinese have only managed now to sort of make a copy lcd for iPhones, and they're trash compared to original.
Try send the part back and say it's faulty, try another part."
