How do I deal with a wrongful termination case?

I was wrongfully terminated today for complaining against my manager about racial discrimination and illegal call recording. I was being harassed and retaliated against for more than 6 months after the complaint. The employer even created a hostile work environment for me, all my colleagues were pulled in to try to fire me for a cause. But I did not sign any document until the end and today the employer handed me a letter stating that my employment status was "withdrawn". But they orally stated that I was being terminated and I never signed any document until the end. I want to take this employer to court because of their false promises and false job security implications. I even bought a house thinking that this will be a long term job because it was orally implied on multiple occasions that this is a secure job. I recently acquired citizenship and my manager started recording my calls after that without consent. Please let me know what to do.