I never answer them anymore, Just not worth the effort. I used to answer, say nothing, wait for the human at the other end to ask for a person, say "Hang on I'll get them" and just put the phone down and ignore it until the loser hung up. My record was 16 minutes. I don't even feel bad about it. They were trying to waste my time, so it's only fair I waste theirs.This is how I usually answer spam calls: