Daughter tells me today she got am e-mail on 1/10 saying that an on-line account she used (FYI UConn store) had been hacked and her credit card (complete information) was on the list...$1200 in unauthorized charges before being able to cancel the card. Banks not open until Tuesday to try to find out what/what not she is responsible for....
Amazon.com noticed a 2nd account being setup with her card and did not permit...way to go Amazon!
I track my on-line accounts/cards not quite daily and once found a charge for $0.13! This is a key tactic of the hackers, they try a small charge and if OK load it up! I cancelled the card immediately and they re-issue cards in almost 24 hrs.
I have one credit card that I don't use much, as soon as anything gets charged to the card they call for suspicious activity. I gladly answer and say Thank You even if my charges.
I highly recommend setting spending alerts on every credit/debit card: get an e-mail, txt message or phone call if $XX dollars charged to card.
If you notice anything at all not right, just cancel the card and have them re-issue a new number. This is not cancelling the account and has no effect on credit rating, just changing the card number.