I applaud you for contesting any DCC charges, but I'd prefer to handle a DCC issue at the time of the transaction rather than spending time calling or writing my card issuer. There was another poster, Happy, who didn't have a good experience with a Chase issued card when contesting a forced DCC transaction in the UAE. The acquirer or merchant responded to the chargeback, and it caused more headaches than the charge was worth. By the time I'm contacting the card issuer, it's on principle because the spread between the DCC amount as Visa amount wouldn't be worth my time in almost all cases.