got a call noone on the other end,...gota bout 3 in the past 2 days

This number called my home phone and i didnt pick up because the ID said "Do Not Use" the answering machine message sounded like someone running through the woods.... it was weird.

They called our house and asked for my fater-in-law. When I said he wasnt here they asked to leave a message and then hung up on me. I have no idea what they wanted.