The last time this happened, I noticed the difference between how different banks and issuers handled this. First Direct handled it without any fuss, as did Nationwide and Alliance & Leicester. Egg said they would not take the money and then did, promised to refund it immediately (over £5,000 because it was over the Christmas break) and didn't; I was very grateful to First Direct for asking why I was asking about the same transaction every day and revoking it under the Direct Debit Guarantee on the spot. It took weeks to get back the lost interest and overdraft charges involved.
This time, MBNA said they will take the money and refund on a later statement even though the direct debit payment would not be raised for a couple of days; First Direct said if it was their credit card either they would not take it or they would refund it as soon as they could. What do other banks do? If you've found fraudulent transactions and you'd like to share your experiences at how it was dealt with, please do (and I've never asked this before, but please do pass this on to your friends list if you feel it's appropriate - I think a wide sampling of responses could be useful to quite a few people. I currently have the poll and responses set as public: if you feel the responses should be private, do say in a comment and I will change them and publish a summary instead). Thanks...
Have you suffered from credit card fraud?
Who noticed the fraud?
Which credit card provider is responsible - if you're happy to say
Did your credit card provider charge you for the fraudulent transactions?