Dear Vikash,
When the security agency removed you, there must have been some reason. It could be because of variety of reasons like mismatch between the expectation of your boss and your performance, your misjudgement, grave mistake by your subordinate, complaint by the customer, getting your replacement with less salary, internal politics etc. When you had been in the job, that time you should have been cautious as to how to protect your employment. Once you are out of job, taking another assignment is your fait accompli.
Filing a suit is fine however, it could take a decade to get justice. Is this acceptable to you. Bark is worse than the bite goes the English idiom. When we relate this idiom to the Indian judicial system then we can saywait is worse than verdict. Therefore, please choose your choice carefully.
In the meanwhile, if you want justice, then let me suggest you via media. Go and approach the Labour Officer of your area and explain the problem. Let us see whether he does something on your behalf.
Thanks,
[b]Dinesh Divekar