Let us consider for a moment that the original poster is 100% in the right, and can win this case. What is it actually going to achieve? What is the big picture here? Does he want to become a commercial airline pilot, or does he want to win this little point and make his stand?
Personally I do not think it is worth cutting off your nose to spite your face. As other responses have already suggested, the flying world is a very small world. You could be seriously harming your career over what is, in the grand scheme of things, a highly trivial issue. If 'taking this one on the chin' is the only sacrifice you have to make in order to achieve your career aspirations, you'll be a far luckier man than most!
Good luck whatever you choose.