They have called me every day for the last several days, and several times just today (December 30th) and leave no message. I don't answer my phone if I don't recognize a number, that way if it is a person, they can leave a message and I avoid junk calls even though I am on the do not call list.

Received a call from this number, would not leave a message. I was gone. Tried to return the call, but got a weird busy signal. They asked for me by my first name. If I do not know the number I let the voicemail pick it up. Someone watching my house answered, and the man would not leave a message or number to call back.