Share transfer/name change & getting duplicate certificates

Hello all, new here so please bear with me. I recently started looking at a bag of old paperwork with share documents and copies. In that, I found out there’s considerable amount of value in few companies. These are from paper certificates bought at face value by my father in the 90s under my mom’s name and my name. My father passed away 25 years ago. The problem is that they were in my mom’s pet name and don’t have actual certificates, but we keep on getting mails from RTA (kfintech) for the folio for KYC update. My mom has all relevant documents in her official name. I contacted kfintech, explained them situation and filled out and sent all relevant forms (name change gazette, indemnity bond, ISR-1/2/3/4, CML, cancelled check, old dividend slips, dividend deposit entry when back accounts were in her pet name (before all the Aadhar/kyc saga), etc.). Now they are asking for govt photo ID / official photo ID of her old name and only thing we have is old co-cooperative society photo ID of house owner ship. Now my issue is that I have been contacting person at Kfintech and am not getting any response. Also, because of the bank account name change to official name, dividends from last 7 years have not been deposited meaning this year shares will go to IEPF. Does any one have any insights on how to handle this? Is better to go to the Kfin office directly in Hyderabad in person? Does that even work? Any advice welcome!