Indian Bank — refund not reflected in my account

I purchased four books from amazon. I had return two books in the same date and refund issued on november 13 of ₹865 & ₹984. I got only the refund of ₹865 n my refund of ₹984 was reflected in my account. I contact amazon regarding they told that they issued the refund n the problem is wit the bank so i failed charge dispute for neary 7 times bt i didn't get my refund still