Are you sure they violated your T&Cs?
The only one they seem violate is point 1.
The screen grab shows they've used your logo, but have you considered they may link to you (ie. in their use the logo is a clickable link to your site), and or they provide acknowldgement somewhere in their app/site, that just doesn't quite happen to appear on the screen grab.
This is clearly giving them the benefit of the doubt, and if so make Edward Snowdon the man you want to go after, but a) good luck, and b) I'm sure he's a few other things to worry about first.