This number comes up repeatedly on our Caller ID, sometimes 3 - 4 times a day. Never leaves a message. We are retired, and always home, but never answer. We screen ALL calls, and only answer those from people or businesses we know or have contacted ourselves.
They're just wasting their time with us. Our phone "speaks" the identity of who is calling ("Caller Unknown," for this outfit), so we don't have to rush over to the phone to see who it is.
Considering how frequently they call, I'm surprised there aren't more complaints here. I'm curious if anyone's ever answered.