Very sad, Sai Sairivalli, to hear this. One mistake all employees make is to submit a voluntary "resignation." Remember, in many cases, companies do not terminate service and instead ask for resignation from employees. The catch is that they do not have proper and valid reasons for terminating your service, and they are aware that they can be taken to a court of law. If they fail to prove the "valid reason for termination," they face shame, compensation, and in some cases, they may need to reinstate the employee to the same position.
My suggestion is to send a legal notice through a lawyer.
Regards,
Ukmitra