Amazon applied for a refund twice for an order, and the seller should complain to Amazon. Refund is between the seller and the credit card company, not between Amazon and the credit card company. Because it doesn't involve Amazon's interests, Amazon doesn't care about the results, and usually uses robots to handle claims. In Amazon's notice, the content of the claim was not stated, but the seller was informed. The seller should make a complaint to Amazon. The complaint should be based on Amazon's policies, and the content should be how the buyer does not abide by the policies in the buyer agreement they signed. Since Amazon is only responsible for notifying the seller and the refund is decided by the credit card issuer, the seller must now take legal measures against the buyer.