That's why it should only raise a flag rather than totally stop. Perhaps the customer service rep can ask a few more questions. It's a similar situation to som

That's why it should only raise a flag rather than totally stop. Perhaps the customer service rep can ask a few more questions. It's a similar situation to someone who only ever uses their credit card to buy small amounts from their local supermarket. Then suddenly they use it to buy a flight in another country. It might be legit, but it's often not, and should suggest that customer service need to do more investigation before approving.