Mari, I'm going to offer here what I would do at this point in my life (when I was younger I would have done something different). I would walk away from this situation without doing anything other than praying for your coworkers and for the management that is not acting in a righteous manner. I would let go of this situation and focus on the amazing new opportunity you have of being on a strong spiritual and charitable path toward Jesus by serving the sick and the elderly and the poor. I would ask myself what would Jesus want me to do now. In most cases, Jesus turned the other cheek. Every employee who works at that company must do whatever he or she thinks is best - whether that be leaving the company, complaining to management (which will get you nowhere- and I know this because I worked in the corporate environment for 10 years - in the last few years as a project manager and training manager), changing jobs to be under a new manager, or just staying in their jobs and trying to make the best of it. I think that it is doubtful that anything you do would result in any changes, not because you are not right, but because that is the way corporations work.And, if you start legal proceedings you will be involved in that for years (if your legal system is anything like ours). I believe your company will ignore what you have to say or try to discredit you. And, you will effectively have burnt your bridges (so to speak). I don't think it is worth the time, energy, stress, etc. that doing this would cause. And, I believe it would totally undercut your focus on your amazing new opportunity. Just let it go. Say goodbye, bless everyone there - your friends, your coworkers, and even your managers. This will have more effect for good than any action taken against the company because good has more power over evil than negative actions have over evil (if that makes any sense to you).
So, bless them, say goodbye to them, pray for them, and move on to your new life. You will have more peace and you will be able to focus on doing good works for Christ and Mary. That is what is important. I'm not saying this is easy to do because I know it is not. But, if you can do this, you will truly feel God's grace at work in your life - and this I do know from personal experience. Money is not important in this life and even less so in the next life. All that is important is living a life of faith, hope, and love. And, as St. Paul said, the greatest of these is love (or charity). So, even though you may not want to, be charitable to the people in management who don't deserve it. We don't realize how our good actions toward others affect them. Doing this may result in far more changes than taking them to task or sticking lawyers on them.
I will keep you in my prayers when I go to Daily Mass tomorrow!