Since the US is usually regarded as litigation heaven, I would say: Sue
them! You can finally make some money with your hobby!
Now, jokes aside, I actually mean that quite seriously, because of the
following reason:
They should not get away with it. If you don't sue them, they'll do it
again. If it is a large publisher, you'll probably get some nice punitive
damages too.
Greetings,
Johannes (who isn't an attourney)
