There is a way to find it, with what might have happened:1. They could have only signed you out, so you could remote login.2. They may have not deleted/signed out of your Google account, so you can do Google find my device.3. PoliceAlso, which phone ...

Hmm... Have you tried replacing the screen? If you can't do that or already did it, try factory reseting it again but in a different way, like holding volume down, bixby button and power at start up. Or you can do a special code in the dial pad : #*#...