Unlawful or Illegal Termination

I work as a senior manager in one of the MNCs in Bangalore and i raised a menta harassment case against my manager who has been mentally harassing me, defaming me in front of my entire team, targeting me and post that during the performance cycle, he rated me as Underperformed for which i did not agree and my manager, HR and skip manager were mentally harassing me to accept the rating or leave the company and due to this pressure, i sent a legal notice when they were putting pressure on me to accept the rating, I contacted a local lawyer and put everything in legal notice with sequence of events and to take revenge and get me out of the company the rating was given and once the legal notice was received i again had a call with my skip manager HR and legal team and post that they sent me an extremely long email saying I was not doing anything I was not doing basic responsibility as manager completely defaming me in an email and told me that this is interim response to my legal notice and after a week I countered all questions with email proof and policies and procedures I copied very senior level people including the CEO in the email response and immediately the next day I was terminated, but even after that I was terminated. I am at a manager level so labour court may not be applicable. Please request your honest and transparent suggestion as to what I do next. What I am feeling very bad is I will not get my bonus as I am not on payroll till 31st December and now do not have a job also. The termination letter says willful obstinacy and even after multiple discussions I did not accept the rating and as per employment agreement of termination of misconduct we are terminating you, sir I would like to know if challenging the rating challenging within the limitations of the rules and policies set by company can this be construed as Misconduct I am a Senior Manager and report in to director. The company says all manager should possess the skill of challenging status quo and I was challenging the rating as my manager never conducted any 1-1 and he was harassing my team members as well and me and previously I raised a complaint on him to internal committee team with all email proof but this case of closed saying we have taken necessary action. End of the day I am at loss because I was terminated and he escaped even after doing a lot of scams. I have also the following question. Will i get my relieving letter, speaking to team members within my company i was told that i will be get a normal relieving letter so there is no impact to my future 1) What should I do next, send another legal notice for unlawful termination and asking to include me in Bonus 2) Should I approach labour court or high court as I am at senior manager level 3) Any approximate time and money it will take to bring all this to closure 4) While all this is happening I cannot be out of job so can I apply for other roles as I have lot of financial commitments and have to pay EMI