Intercasino are better than the other Cryptologic casinos, but in general it's much better to contact their payment processors directly:
http://www.ecashdirect.net/contact.html
I'm not sure what you can do, but surely it's worth a try just getting a friend or colleague to translate your documents. Then send it to them as a Word file (or photoshop it as you said). The worst they can do is say it's insufficient, but at least you'll then know what they expect. Besides, I bet they can find someone to read Korean if they try hard enough!!