Amazon used to be fairly safe to sell but since ebay changed their rules to protect sellers on ebay against scammers if tracking shows the item delivered the buyer cannot put in a money back claim.

The scammers have moved to Amazon as even if you use a tracked service and get a picture of the item delivered if the buyer says its not arrived and open an AtoZ claim Amazon refund them in full.

This is rife now I'm.getting 2 a week at least it's making my choice to continue selling on Amazon a difficult one.

You appeal but they just refuse the appeal