This is all that you can do with it. You can't take the money back unless the culprit is apprehended in real world, which is also harder because they might not be from your country. This serves as a lesson for you and everyone else, next time make sure that you get the product first especially if it is a P2P transaction.
In the first place he should know not send the coins if he is not 100% trust the recipient that he will send you the product or you know the seller very well, Cryptocurrency works on trust, because of it's no third party feature, you cannot recover that unless you trace the location of the receiver, or next time do an escrow.