When the security agency removed you, there must have been some reason. It could be due to a variety of factors such as a mismatch between the expectations of your boss and your performance, your misjudgment, a grave mistake by your subordinate, a complaint by the customer, being replaced with a lower salary, internal politics, etc. During your tenure, you should have been cautious about protecting your employment. Once you are out of a job, taking on another assignment becomes a fait accompli.
Filing a suit is fine; however, it could take a decade to achieve justice. Is this acceptable to you? The bark is worse than the bite, goes the English idiom. When we relate this idiom to the Indian judicial system, we can say that the wait is worse than the verdict. Therefore, please choose your path carefully.
In the meantime, if you seek justice, let me suggest a viable option. Approach the Labor Officer of your area and explain the problem. Let's see if he can assist you.
Thanks,
Dinesh Divekar