This is indeed a legitimate number. When I received a voicemail from this number, all kinds of alarms went off in my head: Scam Alert! However, after reading the thread above, I decided to call them back. After giving them my case number, 'they' (an automated system) only asked me to verify only my last name and ZIP code--public information. They never asked me for my checking account number, etc. Then they asked me to verify three recent transaction dollar amounts. Again, they did not ASK for this information; they GAVE the information and asked me to verify it. After getting off the phone with the fraud detection automated system (877-253-8964), I called the number on the back of my bank card to make sure that all was OK. My bank verified that my card had indeed been flagged because a 'suspicious' transaction. In my case, what had triggered the hold on my card was my attempt to purchase software online from a foreign (Canadian) company only minutes before I received the phone call from the fraud detection center.I think the major problem with this number (877-253-8964) is that it is connected to an omnibus service used by many banks, so when they call in, their number may be labeled as 'unknown' or labelled with a wrong bank name.