Amazon — Not received money

Address:	Badanpur mugarson Allahabad
Website:	Airtel payments bank

I had ordered a product from amazon 7989rs on 4th september and i returned it due to wrong product coming from amazon.
and amazon refund my money on 3rd october and airtel payments bank customer care is saying no refund from amazon.
Today is the 20th but till now my money has not arrived in my account.
Amazon has refunded, they have also given confirmation mail, also given refund reference number [protected]
But Airtel Payment Bank customer care is saying no refund has come from Amazon.
And I am asking airtel payment bank to fill the charge dispute form then they are saying that such form is not available in my bank.