HappyEasyGo — Refund for credit shell of indigo

How can i take the refund of my credit shell because it is informed to me from indigo that you have to request it to the travel agency from which you booked the flight.
My flight pnr no. Is = snfqgn
And last name is = jain
So when will i get my refund back could you pls inform me as soon as possible.