Use your head here Lee. If you've been summarily sacked and you believe it violates the terms of your contract with them (I'm assuming you have a contract which you ran past your lawyer), then talk to your lawyer about what to do. If they guaranteed to pay you for 3 years or whatever, then you should hold them to it. Don't do anything out of spite which would excuse them from having to honour their contract with you.
In the best of all possible worlds, they will have to continue to pay you AND you will pick up another contract (which you should of course run past your lawyer) as well. You're an established guy on the bb scene, making a comeback. Your chance of securing a lucrative deal is probably at its highest right now and will fall off as the comeback phase ends. I advise you to work aggressively to do so and in the meantime get your lawyer to screw MD to the wall.