Order not delivered and refund Not processed

We had booked couple of orders through Amazon.com, these were Rakhi’s to be delivered.
Orders were booked on 31st July and were to be delivered by 10th August.
Order numbers
404-3238569-7302729 and 404-0659705-8115511
Both these orders not got delivered and when filed for refund Neither Amazon nor Seller is responding.
Ned to take legal action and require refund.