I used to work Customer Support for an online casino and we got some crazy ass calls, but never anything as bad as that. I once got a guy freaked out because we sent him a promotion and he started accusing us of getting our mailing list from terrorists - the same people who used his credit card to buy bombs and stuff
I got a few good ones, I once called a secretary when her boss was fucking her. Lol.
Then we also did all kinda jokes, like in matchstick men, with made up titles and that sort of things. But we didn't lie about our product but it was just for the kicks, it wa like a game who made up the craziest call and got the customer to buy.
I won.
There was one who wanted to cancel and everyone at work where listening to that call and they had some serious not to laugh issues when I told the guy that he's like a kid in a candy store.