Once you find out who the caller is, sue them in small claims court.
This link,
http://www.panix.com/~eck/telemarket.html, tells the story
of what this lawyer did. I spoke to an attorney who handles junk
faxes, got his name from the link above, and he stated that sueing
them will eventually cost them so much money that they can't afford to
continue. The key is finding out who called, what company and phone
number, file a complaint with the FCC and then sue them. The link
above talks about sueing them for $500 bucks. I'm in once I figure out
who is calling. Take to any small claims court in your state. Drawback
is serving papers, we must stand together and stop these annoying
callers, the phone companies wont do anything cause they want you to
spend money to block out calls or change your number...