Join Date: May 2002
Location: Pittsburgh
Programs: MR LT Titanium, AA LT PLT, UA SLV, Avis PreferredPlus, HH Gold, Hertz PC, National Executive, etc.
Posts: 31,682
Have you verified whether this was due to change in FX rates over the time period or due to different buy/sell exchange rates by the card issuer?
If it's due to FX changes, I don't see how the card issuer can be liable for the FX risk. They don't make and money on the deal.
If it's due to different exchange rates, I would ask them to calculate the refund using the same metric (not the same rate, but the same type of rate on the different dates) and refund you the difference.