iPhone repair issue

You could pay for screen repair. Even if the other issues started before the screen was cracked, the repair is not going to be covered under warranty because your screen is cracked now.

See https://support.apple.com/iphone/repair/service/screen-replacement

Where did you buy the phone? You will have to return to the country where you purchased it if you do not currently live there.

Click on Get Support in the upper right corner to reach out to Apple directly and schedule an appointment for service.

~Lyssa

Purchase Apple Products from the Apple Online Store, Apple Retail Stores, and many Apple-authorized resellers and wireless service providers.

Your screen is cracked, you can see it when you zoom in. This type of damage is not covered under warranty.

The black spot is from the screen being cracked.

The solution is to have the screen replaced by Apple.