Defamation And Induced Resignation

I was employed with an MNC as Sr Executive in Karnataka. I was hired as individual contributor and in the very next year made the regional head. My rating in initial years were neutral. In 2019, my supervisor changed and with that my fortune. I was rated a 'Needs improvement - 4' (5 is the lowest) and asked to look out for other roles within the company or move out in 3 months if nothing materializes. There were no customer complaints against me nor was a performance improvement plan agreed, per policy. My variable pay was withheld and all appeals to the organization to share evidence of poor performance were rejected stating due process was followed. The organization responded to my legal notice with rhetoric! 1. Can I plead my case before Labor Commissioner. 2. Recovery u/s 33(c) of IDA. 3. File summary suit order 37 of Court of civil procedure. (Don't want to throw good money after bad money, by paying 10% court fees) 4. File a criminal cheating police complaint.