FnF settlement not done after 6 months of resignation.

Hello great communities, I'm really thankful to all whoever started this medium, myself Harshil Patel and I am from Ahmedabad, Gujarat what here situation is I left from my previous company 6 months back still they haven't issued FnF payment plus Leave encashment earlier they were agreed to give(have in mail) but there was some correction in the payments so I have told them to correct them and now they come up with new policy which states that I cannot peruse my career with their client companies,(I am not aware about this policy) lets suppose my previous company X has the clients A,B,C so I cannot peruse my career with their A,B,C companies and that is not done because I am an SAP consultant and there are few companies of SAP and all companies are my previous companies clients, also they have released some of other employees nicely its just because of personal grudges they are not reliving payment, also while so many requesting they have provided my experience letters and with BGC of my current companies they replied them badly. i hope this understand my situation and I am really in a bad shape cause the payment is of my hard work which is salary they hold at the time of my notice period.