of these jerks that call and call and call to "verify" something with Google. I'm now engaging them in complete silence (only when I have time with absolutely nothing to do). By engaging with them on the phone but never speaking it A. costs them money, B. frustrates the h---- out of them, C. ultimately makes them take you out of their system (sooner than later hopefully). Most of all it pisses them off when they can't hear you speak.
Another tactic...say "YES, I'd like to fix whatever problem has...hold it and I'll cut off this other call". Just put them on hold and NEVER come back. And, when they call back, do it again, and again...
Called on 08/09/2013 @ 06:28 PM from Brooklyn, NY. No message left. Robo callers disconnect on 4 or fewer rings, so I set my voicemail to pick up after 4 rings. That way I never get their messages.