Indigo Airlines — Booking Ref:E9VWUD Flight change/cancellation is communicated to me as non-refundable

Address: Bangalore, Karnataka

Hi, This is regarding Booking ref:E9VWUD, I booked by paying a round trip fare of Rs. 23, 182 for my wife and 3 yr old kid travelling to Bangalore from Kolkata on 28th Jan, 2015 and returning back to Kolkata on 15th March'2015. But due to emergency, when I inquired about changing the return flight to 9th March, I was told that earlier booking is non-refundable and for new changed flight booking schedule on 9th March'2015, I have to pay the full fare.The reason given was that my earlier round trip fare was special fare and non refundable for which I have no knowledge and nothing is mentioned on the ticket. Just asking, 23000 which is a way expensive to be considered as discounted fare/special fare is totally non refundable when I am changing the flight almost a month in advance? This is how ridiculous Indigo has become. Thanks, Sameek