I have a customer who is selling my products at twice the price using my pics and descriptions (Copyright infringement??) on their website, ordering them from us to ship to a different shipping address. When their customers can't get in contact with them (they don't return call messages) if they have issues with the product, they then call us even though they are not in our customer database. They want us to take care of the problems! Is there any way to block a certain buyer on Amazon. I don't want to sell to these crooks.