This is what our local law enforcement advised during the serial rapist time (I was in my late teens/early 20’s and had a job that I drove home after midnight). If you doubt the person is law enforcement (usually a car without county or state markings), request that a uniformed officer in a marked car be dispatched to your location. Any plain clothed officer will request from their dispatch that a uniformed officer be sent. As for your situation, NO clue. Our 911 center can receive hang ups (defined that someone in the house called 911 but hung up at some point during the call). Little kids (especially when learning all about 911) may use the phone to “practice” and hang up. The police will respond to a 911 hang up in case something was occurring (a true medical or law enforcement call) and you had to/forced to hang up. I am not sure if all locations have the 911 center/location of home technology.
If you’ve programmed a one button memory phone to be able to call 911, and if you have cats (or maybe dogs)...