Firstsource solutions - FNF Scammed

I worked in Firstsource for * years and * months. Always delivered and did a lot for the company. My full and final settlement is not happening because apparently they think i have not returned the system back. This was retured approximately * years ago. I was working from home. The system was faulty so they asked me to get the system to office which I did and the tech team was working on it. After that, I was asked to work from office itself and ever since then I've worked in office. It's been almost * months now and they are saying they cannot help me out here. This is a ridiculous scam. First of all the systems they gave was old and no one would take it even if was given for free. My teamleader and manager is fully aware that the assets were returned.