BOUGHT A DEMO APLLE WATCH?? HELP***

APPLE WATCH 9

Hey guys I’m reaching out for advice on an Apple Watch 9 I purchased from someone on a third party buy/sell app (OfferUp).

I charged it and eventually brought it to the Apple Store to check; Turns out it was a demo watch from Verizon…

I really was thorough in asking why it was so cheap and trying to catch any suspicious things about it, but the guy seemed so legit.

I payed a lot of money for it and don’t know what to do as I can’t get in touch with the person for a refund, and apple says they can’t do anything to set it up for use.

DOES ANYONE have a suggestion on what to do, either how to get it to work normally (this is the main hope) or who to bring it to to help, or other options?

ANYTHING HELPS please please let me know I’m desperate at this point!