I've been through the exact same thing. My photos were stolen by CNNGo. You can read my misfortunes here
http://www.clubsnap.com/forums/threads/713207-Now-it-s-my-turn!
What I did was to email to CNNGo an invoice that I typed out. Going through them is pretty much useless. You get to a point where you get to have some contact with the correct person and they start ignoring you. They literally ignored my emails for 1 week. (Their HQ is in Hong Kong)
What I did was that I emailed to CNN HQ and they immediately said sorry and they had CNNGo pay me 100 USD. I asked for 200 but they said 100 was the max. So hey, I wasn't expecting to get money out of it. What the heck.
If you have any question you could always PM me.