nick5000 if within 120 days I suggest you fly the ticket first, then chargeback.
Don't rebook. It makes it ambiguous whether you're actually flying or not - the airline may reject your second booking.
You can still agree you enjoyed the services in full but you were charged the wrong currency - but like me enjoying my meal at A Lorcha Macau then disputing their HKD billing
http://www.flyertalk.com/forum/china...l#post17894974 .