Dropped my IPhone 11 on hard ground, only one crack went to screen. However after 2 days, the screen became partially unresponsive (the bottom bit didn’t respond to touch). Now 4 days later, screen is totally unresponsive to touch ; Siri works with Hey Siri, phone unlocks with Face ID, side buttons works, camera works, but the screen. responds to no physical touch. What should I do?