What is your source? This seems fairly fishy and I can guarantee that it has not been gotten through the original methods, which is not necessarily a bad thing depending on the buyer's intentions, but it does limit what the guarantee for such a code can be used for, as it is unlikely it would be supported. Furthermore, it would seem as if your Selly link does not work. I am getting a "Whoops" 404 error, which means that the item is no longer on their site. It is possible that the item has simply gone out of stock, though, but you should check it out.
maybe your IP is blacklist, try other browser for open selly.