Indian Railway Catering & Tourism Corporation [IRCTC] — railways ticket concession for cancer patient

Address:

Door No 6B-1 First Floor, Natwest Vijay Phase 2, , Velachery-Tambaram Main Road, Pallikarnai,, Behind Tata motors & SBH Bank, Opp to Oil Mill Bus Stop, Chennai, Tamil Nadu, 600100

I tried booking the cancer concession ticket for my mother with valid proof and certificate.
Booking application was refused by saying that sri ramachandra medical centre hospital is not in ticket concession list.
My hometown is in dindigul district from dg to ms (Pincode:624204)
They refused to provide other details.

Can you please look in to this matter. As more than lakhs of people from north and south india treated in sri ramachandra medical centre hospital every month.
Hospital side also they refused to provide the details regarding this.