Caller ID reads "Client Services," in Culver City, CA.  They were calling looking for someone who has the same name as I and asked me to verify my address and last 4 digits of my social security.  I didn't give them my information and instead asked them to give me what they had on file and I would be the one to verify.  They did, and it was not my info.  

When I asked what kind of company it is, they wouldn't tell me only saying that it would be "against the law" to do so.  So I'm assuming it's some sort of collection agency.  It seemed legit and they told me they would take my name off of their call list, but I guess that remains to be seen.

I found out it's a legit bill collector that buys debts from Credit First NA and various small credit companies

Debt Collector robo call.  Didn't leave a message.