You've described the method the company used. Nasty, but not discrimination unless it is done more to one group than to another.

You need to consider whether the potential rewards of going after these turkeys, multiplied by your odds of success, are greater than, or less than, the potential rewards multiplied by the odds of success doing something else. My guess is your best bet is to spend your time looking for another job rather than suing them. If you invest your time and energy in looking for work, you will almost certainly succeed. If you invest it in fighting these jerks on their own turf, you will probably lose. And what if the jury orders them to give you your job back?

Move on - invest in shrinks if you have to. Joining a cult would be better for you than obsessing on these guys.

Want a practical suggestion from the Old Country? Write the name of the firm in your own blood on a piece of paper. Burn the paper and never write or speak or think that name again. Curse them that they may live in interesting times and die of natural causes. And then never ever give them another thought. I would reccomend a sterilized pin in a finger tip rather than the more traditional stingray barb through the reproductive organs. My particular Old Country is a bit intense by modern standards.

Move on. Don't wait for the wounds to heal first, they won't. You have to move on first, then heal.