Originally Posted by
TerryK
"It is not possible to cancel transaction" is the standard response when I asked to void DCC.

That is nearly always the answer or it takes forever for them to figure out how to do it. One time it took me 30 minutes to get it fixed, and they refunded me in local currency and rebilled with DCC so I was out 2x DCC. I just do chargebacks now and write on the signed receipt that I wanted to pay with local currency then take a photo.