I got Mary's same story.  Did not respond.  However, I looked up the 323 number on reverse white pages and they said " (323) 202-2310
is a VoIP number with an area code in CA -- Los Angeles.  It appears to be a valid number with low chance it is spam."  I left a message on the http://www.whitepages.com website.  On the page that appears when you look up a number there is a button to click where you can report what you know about it.   Maybe if a few more folks who  have been contacted by Mary leave a comment on the white pages web site it might help some other folks who are not aware of 800 Notes.