Don't return calls to unknown numbers. You risk getting the wrong person unaffiliated with the scam, wasting your minutes, and a vicious charge for the call. While you're doing that, you also invite more calls since you confirm your number works. Sure, it can be fun and entertaining to fiddle around with these idiots, but keep in mind these people are bad news and criminals. You're better off not participating in their games. If you're someone tired of these junk calls, this isn't how you stop them. They're quicker to give up on numbers that have no kind of answer since it's pointless passing those along.