Harrassment from corporate company

I was workings in one of the private insurance company in Mumbai almost 4 years. Due to some issue with my seniors, i gave resigned from the company in Aug2015.I was working as a Surveyor and goes to inspect motor vehicles in different motor workshops.On last day my seniors asked me to bring No objection certificate from this workshop.After submission, the company will give me reliving letter.I asked the all workshop for NOC.But workshops told me to clear all outstanding from my company for NOC.It took more than one years to get NOC from all workshops.and I got the reliving letter from my company in NOV 2016.Because of this, i faced the problem of unemployment and financial losses also this condition imposed on me only. one of my colleague who left the job before me not asked this condition.My last date of the job is 18/10/2015 and I got the relieving letter on 11/2016 .I also want to inform you that there is no legal contract between the company and private workshops regarding NOC.There is also no contract between me and my company on NOC.Because of one year gap to get reliving letter i still facing the problem of unemployment What kind of action can take against Insurance company please guide me.