Indigo Airlines — Refund of canceld ticket will not back in my account

On 13/05/2015 While booking a flight ticket from Chennai to Varanasi, nd my ticket was confirmed, booking ref no. C9FC7D. I made my Payment of Rs.11, 219 through my SBI ATM card. Then i cancel ticket on 17/5/2015. Refund amount after deduction of charges is Rs. 8, 694. But till now I didn't get my money back. I call ur customer care no nd they said ur refund amount will sent u back in ur account on 20/5/2015 but refund amount not back in my account. I check my account but refund not credited in my account till today. I go to my bank but My Bank confirmed that my money has been not credited in my account. I request your attention and a favourable action Thank you... Mayur Kumar Chaudhary Booking ref no. C9FC7D MOB NO [protected], [protected]