After water entered my iPhone screen is not responding

I'm trying to understand HOW water intrusion in your phone means you believe the phone has a manufacturing defect. Water destroys electronics. Liquid damage is not now, nor has it EVER been covered under warranty. To take it to Apple for evaluation, but if the moisture sensors have been tripped, be fully prepared for Apple to deny warranty support to a water damaged phone.

It doesn't matter what you were doing. If you were close enough to permit water to enter the phone, the phone is not defective. You damaged your phone by permitting the phone to come in contact with water. Apple does not warranty ANY phone for liquid damage. Be prepared to pay for an Out of Warranty replacement. Which per the price in this link from Apple, will cost you $599, unless you purchased AppleCare+ when you bought you phone, then the price to replace your phone will be $99. Note: Prices are US prices. Prices in other countries will be different, but inline with these prices.

Here's the link --> iPhone Repair - Official Apple Support

About splash, water, and dust resistance of iPhone 7 and later - Apple Support

To prevent liquid damage, avoid these:

• Swimming or bathing with your iPhone
• Exposing your iPhone to pressurized water or high velocity water, such as when showering, water skiing, wake boarding, surfing, jet skiing, and so on
• Using your iPhone in a sauna or steam room
• Intentionally submerging your iPhone in water
• Operating your iPhone outside the suggested temperature ranges or in extremely humid conditions
• Dropping your iPhone or subjecting it to other impacts
• Disassembling your iPhone, including removing screws

Minimize exposing your iPhone to soap, detergent, acids or acidic foods, and any liquids—for example, perfume, insect repellent, lotions, sunscreen, oil, adhesive remover, hair dye, and solvents.

Pool water contains acid and chlorine.

I'd start here: https://support.apple.com/iphone/repair/service

If it's within warranty, take it to Apple. However, be aware that they may consider it damaged given the screen issue.

Not sure what that means. Again, take it to Apple. But be aware that if the device is water damaged it will likely not qualify for service.

https://getsupport.apple.com/?caller=grl&locale=en_EG

That's not a malfunction of the device. That's water damaged caused by the user.