Calls using bogus ID (numbers belonging to others or fabricated) is "spoofing" and is prohibited by law. File a complaint with the FCC @ http://www.fcc.gov/guides/caller-id-and-spoofing
Contact your Congressman, Senators and request that service providers be held accountable for providing crooks telecommunications network access to scam and harass citizens. Service providers need to be involved in tracking the crooks using them for internet access.