http://www.wired.com/threatlevel/2013/06/yahoo-failed-fisa-f...
It's possible that there's as-yet undisclosed legal action with some of the others; the secrecy around just about any proceeding in the FISC makes it very hard to tell.
Take the battle to the real courts and ask them to decide on the matter.
It's not a court just because congress says so.