Called and hung up. I called back, it was obviously a "call center". The person I spoke to had a very heavy East Indian accent. Wanted me to get "pencil and paper" to write down a "tax case number". He said his name was Daniel Smith. When I said I thought he actually was calling for a company trying to scam innocent citizens he hung up.

Got two calls from this number today, which Caller ID identified as Seal Beach, California. No message left.