First off, shyflower is right. If you can't understand that, you have more of a problem than getting your money back.
If you have any e-mails between you two where an agreement was made, show them to his host, and then cite the issue of copyrights.
Though, in this case, I highly doubt they will do anything about it.
It's not their place, it's the courts.'
Sorry, but we are talking about some articles "stolen." ... Cheap ones, at that.
I mean, come on here.
Now, if it was much more than that, and or if he copied your site, that's another matter.
Learn from this, and get your money upfront. Or, at the very least, half upfront.
Edited to add: A thought has come to me...maybe send him an e-mail (if you haven't done this already), telling him that if he doesn't pay, you will contact his host and Google with the e-mails.
This, by itself, may work.