I had a similar call back in September.
http://community.spiceworks.com/topic/1169088-call-claiming-to-be-from-spiceworkes
I only answered it since it was early morning and I hadn't been caffeinated.
I've also had calls where the caller claimed to be from Dell or HP, but as soon as I heard white paper, I knew they weren't, and politely declined to continue the conversation.