Caller ID says "MASSACHUSETTS". They leave no message.
I call back after hours (using *67 to block my number). I hear the following, "The number you've dialed is not in service. <silence>" The silence goes on for about 3 minutes and then it hangs up on me. If this was some phone company message, there would be no extended silence. I believe the statement plus the silence is their outgoing message.
So they fake a disconnected phone and have a spoofed caller ID. Smells like some kind of SCAM.