Caller ID says "Attleboro MA". They leave no message.
I call back after hours (using *67 to block my number). I hear the following, "Press 9 to be put on the Do-Not-Call list. Goodbye." I never do this as it can actually make things worse.
A spoofed caller ID and the failure to identify themselves on their outgoing message make me strongly suspect that this is a SCAM.