Indigo Airlines — Excessive Cancellation charges. Not allowed to reschedule the flight for a round trip

Address:

New Delhi, Delhi

I booked ticket through www.cleartrip.com for Indigo flight on 27/08/2016. The flight should be from Bangalore to Kolkata on 2nd September 2016 and from Kolkata to Bangalore on 6th September 2016. I did a mistake and altered the destination. Next day morning I realized and called Indigo call centre for rescheduling it in a correct way. But as per them sector rescheduling is not possible an they asked me to cancel the complete ticket and to buy fresh ticket. I asked for a cancellation charge and the charged Rs.5000 (Approximately for round trip), whereas the total ticket fare was 7584. I had to cancel the ticket and again had to bought fresh ticket which costs 12000 approximately through cleartrip.com. This cancellation charges are so huge and airline company is earning this without providing any service to me even though I opted for early cancellation, also they did not allow me to reschedule the ticket which could help me to save much. this is a totally consumer unfriendly policy and cheating in my opinion.
My booking reference no for Indigo was T8ESUS, and booking ID was[protected].