Supposedly giving away free medical alert systems (free???? doesn't pass the snicker test) and free medical/prescription coverage that will save you hundreds or thousands of dollars (see previous parenthetical comment).
If I only say "hello" once, they never respond, probably because a computer is dialing and the live person only gets on the phone if they notice you've answered. If I say hello a second time, the live person comes on the phone so I hang up! I hate these callers!!!!!!