So i recently dropped my xiaomi redmi 9T (i am aware this is a different phone but it wasn't one of the options). The screen broke: some cracks and part was black. Someone videocalled me and i was able to pick up and call them for almost an hour. When i tried to open apps the phone would automatically either press tabs or home, making it impossible to use my phone. i assumed this happened because of the cracks. I brought my phone to the store, they ordered 3 new screens, none of which worked. The guy in the shop told me the problem is probably the motherboard, but that seems very weird to me cos i could still call someone and open my phone. Is it possible that the problem is really my phone or maybe they damaged it after i handed it over?