Indian Railway Catering & Tourism Corporation [IRCTC] — Request for Refund for untravelled Ticket

I Have booked a return Journey from Chennai to Coimbatore on 13.07.2025 in Train no: 12695 vide PNR [protected]. I am aged 76 yrs and my co-passenger is 73 yrs.
Due to fire near Arokonam in Chennai Coimbatore route most of the train are cancelled or delayed start.
This train no: 12695 scheduled to start at 15.20, started from Chennai @21.03 hrs.
Due to cancellation most train, there was heavy crowd and since we are senior citizens, we were unable to enter station with our luggage and we returned.
I filed TDR on 14 th on reaching coimbatore ( we reached late night) filed TDR and awaiting reply