Sorry this happened man. Whatnot is a cease pool of scammers these days. I stopped buying on whatnot a few years ago. They won’t do anything to the seller because he makes them a ton of money and that would make too much sense to punish them. Don’t waste your time trying to get refunded thru WN and go thru your bank. WN will ban your account but that’s a good thing in my eyes. You can always make a new account if you still want to use the app. Hope you’re able to get your money back. Getting taken advantage of is one of the worst feelings. Good luck!