I just received a call from this number. They asked for me by name, and I told them that 'k' wasn't home and I'd be happy to take a message. They declined my offer to take a message for myself and said they'd try back.
I've been getting calls at work almost every day for a week. Hangs-up when I answer with my work greeting. I answered "hello" today and they asked for Chris - I told her she had the wrong number.