[Resolved]  Indigo Airlines — Flight ticket Cancelation

Dear Sir,
I cancelled my ticket no VLDULB, they charged rs 750 as cancellation charges, and the rest amount they reserved as indigo points.
I wanted to know if they are charging the cancellation amount then why they are keeping the left amount as indigo points, instead this amount should be credited back.
This is not a fair practice, in this manner they are forcing the customer to use their flight in a one year time. If the customer doesn't use this amount in a years time then this amount is lost.
If airlines charge cancellation charges, then why they keep rest of the amount with themselves.