From my understanding, the merchants do NOT want you to ever store or "keep" the security codes - they are to be processed in real-time with the transaction, and aren't stored. That way, if a hacker gets into your system, they can't get the CVV2 code.
I think the moral is that anytime a company calls you pretending to be someone, get their information, then call the phone number on the back of your card, and initiate the process that way.
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