Got the same call today. Called them back about fifteen times when they hung up on me. I did a reverse look-up on the # and it is listed in Compton ca. Go figure.
Had two messages today from this number and each one more disturbing than the other. First I get a mysterious message to have my attorney call this person "Mike" back and if me or my attorney don't return the phone call then he wished me "good luck with whatever they do to you". The next message, just a few hours later, says there are criminal charges related to my social security number and that it is imperative I return the call. When I did, twice, an answering machine picks up with a generic "we're not home to take your call" message from the same man with a think accent. I don't know what the deal is but I've only been to CA 3 times in my life and the last time was 4 years ago and for 3 days. This really scared me but seems it's pretty much a scam and I'm at least thankful for that.