Your post is far too cryptic to be of much value. Assuming that you are asking if you have a legal cause to sue the company that confirmed your new job, it is impossible to say. The reason is because we attorneys would have to know more to determine if that new employer actually made a contract of employment with you vice a confirmation of an invitation. In the majority of the cases that I have seen, there was no contract guaranteeing a job at the new company. Thus, the employee is out of luck and unemployed. They have no legal reason to sue anyone for anything. Further, at least in California, they are not entitled to receive unemployment compensation since they voluntarily quit their job.