All the best and always a nasty place to be.
All the above advice is good advice.
Especially the one who recommends a lawyer who actually specialises in this stuff. Many lawyers solely dabble in this (amongst many other things they pretend to be experts on ) and you want someone who does it day by day, not someone who is learning on the job and charging by the hour as they do
Above all keep a smile on your face at work and try your best to enjoy the good parts. That will demonstrate to the bosses that you are not scared of them and are in control of yourself and the process. On occasions you can allow that smile to be a smirk ?
When it comes to the crunch many employers are bullies but like any bully if you stand up for yourself (and it sounds like you are), they are cowards and will go out of their way to make sure it doesn't turn into a cluster fudge for them. Especially the folk who are attracted to HR. I am tempted to say more about those who are attracted but that would result in a ban
Those who keep calm with their integrity and follow the process correctly usually end up in a much better place then their employer, both financially and with respect from others
Those who lose it or don't follow the process, don't
Make sure however you don't have any meetings without your own legal help