They claimed to be my credit union fraud prevention services. BUT, the first red flag was that they were calling about a visa debit card that had been stolen and therefore closed out a few weeks ago. The second red flag was that they asked for the last 4 digits of my social security number. At this point I hung up and called the number on the back of my credit card. They verified that they had NOT called me and to never give out my personal info on an incoming phone call. Bottom line for me, is if you get a call like this, hang up and call the number on the back of the card. It IS possible - and actually pretty easy - for scammers to imitate phone numbers and caller ID.So of this IS a legit number, if you hang up and call the number on the back of your card you'll be safe every time!