These scammers keep changing their numbers. Its always from 360 area code. When I first started receiving these calls I made a complain with the FCC since my number is under DO NOT CALL list. They keep changing their number so FCC won't catch up with them.
I just changed my home phone to an unlisted number on Friday and got a call from these people on my new number this evening! I answered and no one was there so I quickly hung-up. So much for having an unlisted number :(