Hello from Amazon Selling Partner Support,

We understand that you contacted us to seek for assistance on how to deal the buyer of order 112-0586196-6433041 as they are threatening you to leave a negative feedback if you did not grant a refund.

What we recommend for sellers for this kind of situations is to first communicate with the buyer politely and attempt to de-escalate the situation. However, if the buyer still forcing their abusive request, you may consider it as a violation as it is violating Amazon's Community Guidelines.

To report a message, click the "Report Message” button on your “Buyer-Seller Messages” page, the Seller App, or the email you receive. Then select the appropriate reason for reporting and click the "Report Message” button that is displayed at the bottom of the message to submit the report.

Use the “Report Message” button to report any suspicious activity to Amazon, such as messages you think are spam. While we cannot investigate every reported message, we analyze this data to identify patterns of suspicious activity and prevent such abuse in future. Once a message is reported, you are not required to respond to the message or mark it as “No response needed”. There is no need to remove a reported message from your inbox.

For more information about Buyer-Seller Messaging, see the below help page:
https://sellercentral.amazon.com/gp/help/G200383320

Community guidelines
https://www.amazon.com/gp/help/customer/display.html?nodeId=201929730