Unfair charge.....who to tell?

Awhile back I ordered a case for my new iphone. There were a few weird charges along the way and I corresponded with someone in the U.S. What I didn't know when I ordered it, is that it was a company in Korea, with a warehouse in the U.S. The funky initial charges were because of the way Korea had to figure out the exchange rate. A person in the U.S. told me it would all come out properly in the end, on my VISA. We corresponded several times, and it all seemed legit.



Well, they eventually charged me a few dollars more than the initial bill was for. I've written to this person in N.Y., and he asked if I would accept a money order for the over-charge, in stead of crediting my VISA. I said that would be fine. But I never received it. I emailed him again, stating that even though it's a small amount, my concerns were that this company might be doing this to all it's customers, and making quite a profit. It's been a couple weeks, and I haven't heard back.

I will write him one more time, telling him that I will inform so and so about this. Now.........who do I inform?

Thanks.

Unfair charge.....who to tell?