These criminals use bogus caller ID info, but I played along and acted like an interested sucker until they transferred me to the criminals hiring them. They call themselves "Consumer benefits alliance" and their real number is 888-922-4415. Call them back and give them hell.
Note to posters: William picked it up a huge notch and found the criminals hiring the call centers. Let's hope others follow suit - William's method will eventually work to cut down the calls after the cubicle dwellers have to wonder if they're going to be exposed to the world and to the process servers, who'll have their identities and haul them into court. Way to go!