Full and Final Settlement not done from past 6 Years

Dear Sir, I have worked with one of the reputed company in India for close to 5 Years, and submitted a resignation with a notice period of 2 months instead of 3 months and requested them to adjusted in my leave 90 days total accumulated leaves. On my last day of working i have submitted my no dues clearance in presence of reporting manager. Later i have been contacting HR for my clearance of dues and for revealing letter he said he has not received my NOC from Branch Office, due to some personal issues BM has hold my NOC and asked informed HR not to submit relieving letter, not knowing reason why ? Tried contact plenty of times to BM he was not responding and HR was also not supporting me with the same reason as NOC not received. After the continuous follow up with HR later i got a relieving by mail copy. Since than i wrote number of mails no response from either HR nor from my reporting boss, i also marked CC to CEO of the company also and he just ignored it. I have personally visited to corporate recently i discussed with AVP HR & CEO with my humble submission they have agreed to settle the my dues but again they are showing the same colors and behaving as they were before. Approximately i need to get an amount of Rs close to 3.5 Lakhs including gratuity. Can any body guide and help me in this case.