Non payment of notice period salary,PL Balance amount & Gratuity

I was accounts manager worked with company for 21 years , my resignation accepted by co but they were forcing me to give 30 days’ notice whereas, as per my appointment letter notice period was 30 days either side or in lieu of that payment, I gave 23 days’ notice period and asked to adjust 7 days from my balance 100 days PL, all handover given and signoff taken, since I got another opportunity I joined immediately and didn’t wait to complete full and final physically. After few months I sent full and final form with claiming to release my last month salary, PL Balance amount and gratuity – company is not ready to do as saying you didn’t served full notice period, handover is not given and f&f is done physically. Company owner belongs to criminal background and no of cases on this company please advice how can I get my money, total due from the company is around 6 to 7 lakhs. Though gratuity claim form,F&F form all sent company is lying not given by me I have speed post receipt also. I have fear if I case via labour court if he do any case against me for any past issue. Almost nine months have passed I left that company.