Fraud and Walmart
Just had to second the comment about a possible correlaton between Walmart and fraud: when my visa debit was skimmed in Hungary/Budapest ~3 years ago (didn't use it for purchases, in my view it had to have been something with the one ATM I used though I can't know for sure) I got the automated call from VISA fraud when it was used twice at Walmarts in coastal Mississippi (between Ocean Springs and Biloxi) - a state I have never been to. So perhaps there is/was a relationship with Walmart being a place stolen card numbers could be successfully used. Perhaps this is a reason walmart (along with Target now, for obvious reasons) are pushing chip-and-PIN cards.