What he actually did, was accept your two week notice. When you refused to sign, you were saying you quit. I have seen this happen before and unfortunately if HR okay's this, there is not much you can do. It is seriously unfair, but listen carefully, he did not have a change of tune, because he spoke with his lawyer and found he was wrong in firing you. You and your coworkers believe this, because it sounds plausible, but it is not. When HR is in the room, laws are being followed. Employers ARE allowed to accept a resignation, even if it is not a written notice, said in jest, or simply implied. You may be able to collect unemployment, but unless you sign the paper and stay ( which I personally would not) or leave with a two week notice, there really is nothing else you can do. Sorry. Peace!