They kept calling and hanging up, no message. I finally picked up in time once, and a young man fumbled around something about "SAT Prep Company, may I speak to the parents of ___________ [my name]." So they somehow had my name, age, phone number, and scholastic level.
It called many of my friends as well, all of whom recently took Collegeboard's PSAT test. The person on the phone never said Collegeboard, so I don't think it was legitimate.