Amazon Seller fraud, buyer, refund but no return of product Internet

Amazon helps buyers steal sellers property even if you follow all of the policies.  I had been an Amazon seller for many years and never had a problem until recently.  Recently an item was purchased via my Seller Account on Amazon.   The Buyer received the item on time (with me paying ~$10 more in postage than Amazon obtained from the customer).  The buyer stated that he no longer wanted the item and wanted a refund.  As directed by Amazon email I sent a message to the buyer stating that when I received the product complete and undamaged that I would return the money.  This was one of the options that their email stated I could use.  Amazon refunded the money without my consent and before the buyer returned the item.  When I explained my problem to Amazon and asked them to reverse the refund until my property had been returned, they stated that it is not their responsibility to get the seller to return the item.  So now I don't have the money or the item that I was selling.  In my opinion, this means that Amazon just helped the buyer STEAL my property.  The buyer is holding my property without my consent.  Amazon in repeated emails has told me that it is not their problem and that they have no plans to fix this issue that they created. Amazon is contributing to the theft of my property.