Do bear in mind that one of the lies clerks are instructed to tell people who notice that the dcc scam is being perpetrated on them is to tell them the amount listed in your currency is just an estimate for your convenience and that you are really being billed in whatever the local currency is. Of course when I come back and say then why am I being asked to sign a statement that I agree to the conversion rate and the decision is final, they quickly shut up.