I got one of those once. Tried wasting their time but they weren’t having any of it. Wanted to get straight to the sale?? of this supposed cruise I won. Wanted my credit card number. They thought they had me in the bag, but I had a card up my sleeve. See, a lot of credit cards and credit card systems have these dummy card numbers you can enter to test the system. The POS will recognize the card number as valid and try to run the charge without flagging it as an invalid number. I slowly read a couple of these to them with it coming back denied each time. Kept trying over and over, LOL. “I don’t understand! I have lots of money in that account! Let’s try again, I’ll read it a bit slower this time.” Hahaha