Indigo Airlines — money not refunded in account

Address: 123029

Dear sir,
I am pramender, i booked a ticket from indigo airlines on 31 oct. When i was paying the amount 8638.00 via debit card it is declined three times then i tried to pay through net banking that was successful but when i checked my account statement all four times transaction were debited from account. Then i contact to indigo care they said it is initiated by them and will refund in your account in 5-7 days. Money of two transaction is refunded but 3rd is still pending. Now on 12 nov indigo refused to pay the amount, they said they not get your amount. About 12-13 days they tell me that the amount is initiated by them and will reflect in your account within 24-48 hrs or sometimes 5-7 days but now they refused to return the amount. Please accord my complaint and solve the matter at the earliest. I am very grateful to you for this act of kindness.
Thanking you
Your regards
Pramender