Report them on donotcall.gov. I just did it for the second day in a row. Maybe if the Feds get enough complaints about these clowns they'll actually do something about it.
Called me too, but hung up the instant I answered. I've given my cell number to a few random people from Craigslist, after years of never giving it to strangers. It's not posted on Craigslist though. Maybe this is what I get for giving it out so easily.