Beware of this if you get a call. You can never be too careful.
Hope this will not happen to you. I received this email from a close friend:

Haven't checked on this personally, but am forwarding it because it sounds
> > pretty ominous.  
> >
> > > > >
> > > > > This one could fake out the most cautious!
> > > > >
> > > > > My husband was called on Wednesday from "VISA" and I
> > > > > was called on
> > > > > Thursday
> > > > > from "MasterCard." It worked like this: Person
> > > > > calling says, "This is
> > > > > Carl
> > > > > Patterson and I'm calling from the Security and
> > > > > Fraud department at
> > > > > VISA. My
> > > > > Badge number is 12460. Your card has been flagged
> > > > > for an unusual
> > > > > purchase
> > > > > pattern, and I'm calling to verify. This would be on
> > > > > your VISA card
> > > > > issued
> > > > > by (your) bank. Did you purchase an
> > > > > Anti-Telemarketing Device for
> > > > > $497.99
> > > > > from a marketing company based in Arizona?"
> > > > >
> > > > > When you say "No," the caller continues with, "Then
> > > > > we will be issuing a
> > > > > credit to your account. This is a company we have
> > > > > been watching and the
> > > > > charges range from $297 to $497, just under the $500
> > > > > purchase pattern
> > > > > that
> > > > > flags most cards. Before your next statement, the
> > > > > credit will be sent to
> > > > > (gives you your address), is that correct?" You say,
> > > > > "Yes".
> > > > >
> > > > > The caller continues..."I will be starting a fraud
> > > > > investigation. If you
> > > > > have any questions, you should call the 800 number
> > > > > listed on your card
> > > > > (1-800-VISA) and ask for Security. you will need to
> > > > > refer to this
> > > > > Control #
> > > > > (then gives you a 6 digit number). "Do you need me
> > > > > to read it again?"
> > > > >
> > > > > Caller then says he "needs to verify you are in
> > > > > possession of your card.
> > > > > Turn the card over. There are 7 numbers; first 4 are
> > > > > 1234 (whatever).
> > > > > The
> > > > > next 3 are the security numbers that verify you are
> > > > > in possession of the
> > > > > card. These are the numbers you use to make Internet
> > > > > purchases to prove
> > > > > you
> > > > > have the card. Read me the 3 numbers."
> > > > >
> > > > > Then he says "That is correct. I just needed to
> > > > > verify that the card has
> > > > > not
> > > > > been lost or stolen, and that you still have your
> > > > > card. Do you have any
> > > > > other questions? Don't hesitate to call back if you
> > > > > do."
> > > > >
> > > > > You actually say very little, and they never ask for
> > > > > or tell you the
> > > > > card
> > > > > number. But after we were called on Wednesday, we
> > > > > called back within 20
> > > > > minutes to ask a question. Are we glad we did! The
> > > > > REAL VISA security
> > > > > dept.
> > > > > told us it was a scam and in the last 15 minutes a
> > > > > new purchase of
> > > > > $497.99
> > > > > WAS put on our card.
> > > > >
> > > > > Long story made short...we made a real fraud report
> > > > > and closed the VISA
> > > > > card
> > > > > and they are issuing us a new number. What the
> > > > > scammer wants is the 3
> > > > > digit
> > > > > number! And, once the charge goes through, they keep
> > > > > charging every few
> > > > > days. By the time you get your statement, you think
> > > > > the credit is
> > > > > coming,
> > > > > and then its harder to actually file a fraud report.
> > > > >
> > > > >
> > > > > The real VISA reinforced that they will never ask
> > > > > for anything on the
> > > > > card
> > > > > (they already know). What makes this more remarkable
> > > > > is that on
> > > > > Thursday, I
> > > > > got a call from "Jason Richardson of MasterCard"
> > > > > with a word for word
> > > > > repeat
> > > > > of the VISA Scam. This time I didn't let him finish.
> > > > > I hung up. We filed
> > > > > a
> > > > > police report (as instructed by VISA), and they said
> > > > > they are taking
> > > > > several
> > > > > of these reports daily, and to tell friends,
> > > > > relatives and coworkers.
> > > > >
> > > > >
> >
> >
> >