General Discussion

Any unsolicited call about financial information. Should be declined. Flip your card over and call the number in the back of the card. Anything that can be resolved by phone you can resolve with a call you initiate.

That way you know you are speaking with someone you have agreed to have a financial relationship with - not someone who randomly got some information about you and is seeking more, in order to perpetrate a fraud.

I don't know the details of everything that can go wrong, but phone numbers and credit cards can both be skimmed, so confirming that whoever is calling has reached a person who is connected to a specific active credit card at a specific phone number helps them build a financial profile connected to you. The more information they have, the easier it is to effectively perpetrate a fraud.

And most of the credit card calls are, unfortunately, legitimate - so they are training people to give, or confirm, financial information to unknown, unsolicited callers. The only way for you to confirm who you are talking to, is for you to initiate the call.