While legal action is always an option (and sometimes the best or only), begin with the chain of command. bring it to the attention of their supervisor, then that person's manager, then the department head, then to the governor, if necessary. Never give them any documentation (give them copies, notarized and get a receipt of acknowledgement). It takes a long time, but I have seen it be more effective on occasion than going straight to court. It was a similar case, involving adoption and custody, and ended with the department basically being dissolved and reformed under new management.