Hello from Amazon Selling Partner Support,

I understand that ___ 

Your appeal is under investigation. You'll receive an email update on the status of your appeal within 3 business days from the day that you filed the appeal. You can also check Seller Central for updates.

Rest assured that after the successful appeal of the claim, be informed that this will neither impact your order defect rate(ODR) at all and the refunded amount will be credited back to your account.

The A-to-z Guarantee protects customers when they buy items sold and fulfilled by you. Our guarantee covers both timely delivery and the condition of the items you sell. If customers are unsatisfied with either and cannot reach a resolution with you, they can file a claim with us.

For more information about the A-to-z Guarantee policy, assistance in navigating the A-to-z Guarantee claim process, and to learn how to avoid claims in the future, you may want to visit the help page below: 

About A-to-z Guarantee claims
https://sellercentral.amazon.com/gp/help/G27951