Go to http://www.fcc.gov/complaints. Got this off another phone # lookup site - you can file a complaint with FCC and supposedly they will eventually shut them down if warranted. There is an online form to fill out including information like when they called - so if you can keep track of repeated calls they all can be entered. It does take a few minutes to fill it out - but its not too bad, then at least you feel like you are doing something and if enough people do it maybe the FCC will stop them.