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MasterCard won't disclose who leaked my credit card details
I found a german article describing the legal situation in Germany. To summarize As outlined by the many possible reasons in the other answer, it is unclear from the information I have, whether condition 1 holds. Also condition 2 may not hold since the credit card was frozen. I suppose this makes a good argument to MasterCard and my bank, but I also suspect they will not care unless it comes with a attorney letterhead.