I wait, talk to the human, and help them to realize they have the worstest job in the world. Then I add them to my cell phone, but mark the SEND DIRECTLY TO VOICEMAIL box. A few choice words describing her [***] helps too.
Just got called by this number a minute ago. Caller ID came from "DC USA." I have a friend who lives in DC so I answered it, thinking he might have gotten a new number. An automated message started, which said "Congratulations, you've been selected to win a free cruise to the Bahamas. This is a free, all-inclusive trip. To get more information about this cruise, press one to complete a survey...." At this point I hung up.