At first he introduced himself that he's from a government agency. Had Tried to ask for the last 4 digit of my ss number and when I gave it he said it was invalid. He repetitively had me say it. Then finally, he asked me to give the full number. That's the time I sensed that probably he's a scammer.
Called 2x on the same day, i did not answer. Left a voice mail of a recorded voice saying "to find out more information about this case file call the number back" and repeated the number