These were telemarketing operators who didn't have physical access to the credit card. Anyway, back in those days the data wasn't encrypted yet. So I fear I have led you to squander an insightful comment.
It's easy for an old timer to forget that people under the age of 40 have never ordered anything over the phone. At the time I'm talking about, the web was years in the future, and it was illegal to conduct commerce over the Internet (which we called "the ARPANet"). Most businesses ran entirely on paper, and most people had never seen a computer in person. Usually in the movies or TV they'd use a 7 track tape drive as the prop "computer", although those were obsolete even then.
So believe it or not, back then it was common to call a vendor on a phone, verbally tell him what you want, and then read off your credit card number and expiration date. This was simply the way you bought things if you weren't shopping at a bricks-and-mortar store (which we called "a store"). Nobody was worried about "identity theft" because thieves still dealt mainly in cash and transportable valuables and crooks were only just then cottoning on to the value of information.
You could also buy stuff by writing a letter to a vendor listing what you wanted and enclosing a check or money order (which was a check you got at the post office in exchange for cash and and extra nickel). Six to eight weeks later your stuff would arrive. For some reason it was always "six to eight weeks". That's how we used to buy stuff like propeller beanies and x-ray specs from poorly printed ads in the back of comics. The x-ray specs were a bust; all they'd do is make girls think you were creepy, which was actually kind of the point. You could also send away for itching powder and books of allegedly comical retorts you were supposed to use if somebody said something that made you feel bad and you couldn't think of anything original. "May the fleas of a thousand camels infest your armpits." That material killed -- usually the kid who tried to use it.
It was a simpler time. Kids couldn't get access to porn (which we called "dirty pictures") because they kept it on a shelf higher than we could reach. You had to know to sneak into the firehouse when the men were out on an alarm. We didn't have gaming consoles so we had to make our own fun. We'd go out in the healthy fresh air and throw rocks at each other. That was our version of a "first person shooter". Sometimes to fill up the time we'd have fist fights with kids who were a different race or religion from us. Or from the other end of the street. Or were just there. Believe me it kept you on your toes when you were walking home at night! But it wasn't hateful, it was just something to do when you don't have "Grand Theft Auto" to keep you distracted. The next day we'd be having a pickup baseball game (no adult supervision for *us*) down at the sandlot with the very same kids we'd just fought. We'd laugh, exchange insults, and swipe the other guys equipment when he wasn't looking, just as if nothing happened.
And I swear, every word I've written here is true.