About six months ago, some debt collection agency started calling me about every other day thinking I was some guy named “Phillip”. I’m not Phillip, I don’t know any Phiilips, and I told them this but they kept calling. I told them to put my number on the Do Not Call list, and they said OK. But they kept calling. I tried to block them, but they were spoofing their number and it would come up as a different one each time. I could always tell it was them, because the caller ID would show a long distance area code that I didn’t recognize. But, nothing was working with these assholes.
So about three weeks ago I decided I’d had enough and I would start being evil to their phone jockeys. I’m not sure where I got the idea for this particular tactic (it’s not original to me), but I tried it three weeks ago and lo, they haven’t called me since. This is what I did:
ringring
me: 911, what’s your emergency?
them: Ummm.
me: This is 911, what is your emergency?
them: May I speak to Philli-
me: Do you have an emergency, sir?
them: Uh, no, I’m trying to reach Ph-
me: Sir do you realize it is a felony to report a false emergency?
them: I don’t understand.
me: What is your location, sir?
them: …
me: Sir, what is your location?
them: But… I’m not…
I let it go on for a little while like that, and then I just hung up. I couldn’t maintain it any longer because the guy was terrified. Poor guy was shitting bricks, and I was about to crack up, which wouldn’t be in character for the pissed off dispatcher voice I was using. He probably still thinks this number routes to 911. Doesn’t make a whole lot of sense that it would, but I’ve never credited these guys with an abundance of brains.
They haven’t called me since. 
I’m sure someone will comment that what I did was illegal or some-such, nut I don’t really care. It worked!