Old Delisted Companies Physical Shares

My father has old delisted companies shares like
Rushbh Capital Fin Services Ltd,
Shoppers Investment & Finance Company Ltd,
Sarigam Steel Ltd,
Ravlon Pen Company Ltd,
Avon Container Printers Ltd
We know these companies does not exits or merged or liquidated and delisted from stock market.

As Investor can I get any refund of any of these shares. Shares are in Physical certificates form. If yes then how? What’s the process for it?

You have to contact the RTA for each of the companies. If it’s not on share certificate, search online