F&F not done even after 2 years of issuance of relieving letter

Sir, I am Naveen Shrotriya, I was working with a Cement from Nov 2010 to July 2017. I had joined as Sr.officer at Sedam (Karnataka) plant and was later transferred to Ahmednagar depot in May 2012 as Ahmednagar depot was underperforming that time. When I joined Ahmednagar depot the sale was average 1500MT monthly that I increased up to 4800 MT monthly by 31.03.2017 and of total sale 70% was trade business. Management also sent me to Foreign trip in 2016 after evaluation of my contribution for FY 2015-2016. Than there was change in top management,On Jan'2017 I was told to report to Mr. xyz,who started abusing me for no reasons though I achieved all targets for FY 2016-2017, this was the first time I had faced such behaviour from any of my seniors I continued giving my best to the organization but Mr.xyz held my annual increment and called me to Hyderabad to discuss for the same with branch accountant. At Hyderabad Mr. xyz along with HR head that time blamed me for wrong practices involved for doing business at Ahmednagar depot and for the same he had no evidence when I denied he took me to Mr. CSMO of Birla Shakti Cement & he threatened me to make my life hell if I don't resign, since no option left I resigned on two months’ notice period on the 04.07.2017 and to my surprise I was relieved on 05.07.2017 just after a day of resignation and was also threatened to not to step in the office by Mr.xyz through that time Ahmednagar depot in charge. I had recovered market outstanding of Rs.7 lacs post my resignation but Mr.xyz continued giving my wrong feedback to other companies & till dates I am struggling, I have even sent legal notice to the company through my lawyer but not received any reply, please suggest.