Speak with a lawyer. You may or may not have a case that will hold up in court, but regardless a lawyer will be able to tell you more about what your options a

Speak with a lawyer. You may or may not have a case that will hold up in court, but regardless a lawyer will be able to tell you more about what your options are (including a number of options well short of going to court) and what leverage you do have, as well as potential repercussions.