Did not leave message on machine.  Called on August 4 at 10:30 AM

Caller ID says "Name Not Found". My machine does a great job of answering (whether I am home or not!).  No message.  I think this is a scam.  Have received multiple calls with 000 in the middle. I don't ever answer these calls.  They have stopped for now....don't know if they will begin again or not.