I once had a representative from Vanguard call me, and the first thing he asks me for is my security questions. I responded with "I can't be certain you're actu

I once had a representative from Vanguard call me, and the first thing he asks me for is my security questions. I responded with "I can't be certain you're actually from Vanguard" and he got really annoyed. He was legit, I called them and got him on the line and we went from there, but it was obvious from the exchange most people just happily oblige their info.