Ask HN: Best practices for alerting foreign authorities of credit card fraud

We've caught someone in Vietnam using a stolen credit card to make a couple of purchases on our site. The genius used his work email. We contacted his employer, they confronted him, and he admitted to the fraud.

That being said, he is now refusing to pay for the purchases he's made. We've given him multiple chances to right his wrong, but he continues to argue.

I'm tired to wasting time with the emailing back and forth, and have decided to turn him in.

The problem is, I don't know how.

Is there a proper procedure to follow?

Thanks in advance.