SAV inadmissible

I ordered this product, supposedly easy to install. Any record in the package, just a pattern. Unable to operate the converter, I sought advice from three computer scientists. It turned out that my equipment was not compatible. So I asked back. The seller sent me a long email, sewn mistakes, with a translation into French approximate giving a very bad tone to the mall (not commercial). After their email I re-tell them that it's still not working. They ask me to send them the bill and put my order and invoice the cost of return in the package. What I did. And there, they reimburse the item is 16.89. If the initial 12.95 shipping Leaving aside, they could at least pay the cost of return amounting to 6.50 hindsight, I should have kept the article and sell it in France. What upset me deeply is the long mails uncomprehending of the seller, his request to the invoice cost of return (why? If it is not to repay ?!) and lack of business sense . Commercial, I have made a gesture of goodwill to satisfy the customer. There you will have the right to email a tone shifted to announce that they do not repay, and that in short, it's your fault ... A word / liseur ... A tip, order ! But not at home!