Indian Bank — i'm complaining about the cancellation money for the product my power bank in amazon

Address:	No :5/4 pallavan salai, Perambur, Chennai, Tamil Nadu, 600011
Website:	Amazon

I ordered mi power bank in amazon on 9th april due to some shipping address problem, i canceled my order and they told that in it will credited between 3-5 business days according to that my dead line is april 16th but still i did not get my refund, i am waiting for more than a week still i did not get... Customer service of amazon told that they have finished the transaction but still it is not credited into my account.