Positech, give me back my money!

So years ago i bought your game “gratuitous space battles”, i received a CD-KEY that i then used to play, but about a week ago you guys made all the keys of thousands of players to not work, our keys are no longer available and we cant play! the forums on steam are flooded with complains but ignored completely. Give me back my key or my money, i payed for it! or you will see a twitter flood of really bad things!