Excellent advice!  I cannot emphasize enough that the majority of these calls (often when you phone, the recorded voice will roll over to another recording and ASK FOR EITHER LAST 4 DIGITS, OR THE ENTIRE S/S NUMBER. Any person in the world can go on line and find out the rest of your S/S number. There are bogus sites that will supposedly (if you pay) provide full S/S numbers plus b/dates. They "blame it on the computer--that is, these massive dialer systems." You were wise to block it, and to ask her the last 4 digits. These people are moronic goons who sit in a back room and wait for a computer to blast their screens. Then, they start (if you call back, and I suggest you never return any call unless you know exactly who it is--if it's legit, a voice mail will tell you who it is and you may respond ONLY if it is germane to your life) with the S/Security number (!), or birth date, or full account numbers. Then, it may be (and increasingly IS) passed on to any country, site, city or town and your ID is gone). Thank you for an intelligent post.  Protect yourself because these machines are owned by millionaires and the drones get $7./hr. Your life and ID is worth far more.