Indian Railway Catering & Tourism Corporation [IRCTC] — regarding refund

Address:	Udaipur, Rajasthan, 313001
Website:	irctc.co.in

I was waiting for irctc refund for waiting list tickets. Later, i realised that i need to file tdr within 72 hrs. Does it mean that irctc will forfeit rs. 11, 500/- of mine? They must have a proper system in place to refund the amount of passengers not travelled. The ticket checking staff must also provide not travelled certificate on his own to layman or at least educate (Make aware) the passengers. There must be a way out to get my money back. The railway must check their records within a fair time period and refund the passengers fairly.