The credit card bill came a couple of days ago and it appears I was charged twice for Moviepark. I posted on the JoyGP forum and got this response
I'm unsure of what to do. Seems a bit off that they've let me be charged twice for one product.
On May 14th 2003, you payed KRW7000 for MoviePark and KRW7000 for Charging Mileages.
But it is too late to cancel your transaction.
So I can give you 7000 mileages if you don’t mentioned.
If you want to refund, let me know your paypal account. (Bank transfer fee is more than U$10.)
I'm unsure of what to do. Seems a bit off that they've let me be charged twice for one product.