Old Essar Oil physical shares → Nayara Energy – how to dematerialise / claim status?

Hi all, We’re stuck with a very old share issue and need guidance. My dad bought Essar Oil shares in 1995 and we still have the physical certificates with us. Details: Shares: 100 Date: 21/04/1995 Later Essar Oil became Nayara Energy and the company was delisted. We never received any letters about exit offer, payout, or conversion to Nayara shares. No cheques, no emails, nothing. Now we want to know: 1. Are these shares still valid under Nayara Energy? 2. Was any delisting payout already done in our folio? 3. How to dematerialise these physical shares today? 4. Should we contact Nayara directly, Link Intime/MUFG, or KFin? If anyone has gone through this exact Essar → Nayara process, please share: Step-by-step procedure Which forms are needed Typical timeline Any real experience dealing with their RTA Feeling totally lost with this 1990s paperwork 😅. Any help would be appreciated.