[Mz]

A rule of thumb I use: Do you think you can get more out of them than you could earn if you invested your time elsewhere? Do not put more time into it than makes sense under that rubric.

I am disinclined to sue people, fight with them, etc. Go ahead and ask for more and see what you can get. Then move on. Work on building a life for yourself. Try to learn from your mistakes so you don't repeat them. (If you do it right, you get to make entirely new mistakes on a regular basis.)

Best of luck.