Offer your thoughts or opinion on the input financial query or topic using your financial background.

Dispute credit card transaction with merchant or credit card company?
Most merchants (also in Europe) are reasonable, and typically are willing to work with you. credit card companies ask if you tried to work with the merchant first, so although they do not enforce it, it should be the first try. I recommend to give it a try and contact them first. If it doesn't work, you can always go to the credit card company and have the charge reversed. None of this has any effect on your credit score (except if you do nothing and then don't pay your credit card bill). For the future: when a transaction supposedly 'doesn't go through', have them write this on the receipt and give it to you. Only then pay cash. I am travelling 100+ days a year in Europe, using my US credit cards all the time, and there were never any issues - this is not a common problem.