You haven't been robocalled, ever? Some of these guys are extremely sneaky. I once got a call offering something free, blah blah, and suddenly they ask to confirm my personal info. Turns out that confirming your personal info is somehow warped into "accepting their service", and that's how I got rammed with a useless life insurance product or something like that. I got stuck with that for 2 years, and the only way I got out of it was by defaulting on my credit card, negotiating a "pay less than full balance, cancel my card" so that the card was forcibly cancelled and thus the scammers were no longer able to charge my now-dead CC.
The only saving throw you have against these guys is to hang up on them. It's the only way to be sure. Once you speak, you might as well have given them a copy of your CC to charge you a new yacht.