Scammers are calling hotels again asking to be connected to room numbers. If they get an answer they say they are from hotel corporate and that there was a problem with the guest credit card.
They ask for the credit card information, take it, then tell the guest that they are discounting the room 40% for the trouble.
Make sure your desk clerks get specific names with room numbers before connecting. If you have an automated system keep an eye on it.
Maybe even post a sign at the front desk saying, “Never give out credit card info over the hotel phone”. Just a thought.