I purchased a fake Chinese antique porcelain and request return

Neighbor
I purchased a fake Chinese antique porcelain, the seller described it is antique and Ming Dynasty.
It’s a 100% new item as just made yesterday when I received it.
But the seller didn’t accept my return request, how can I do? And if OfferUp protect buyer right?
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Community Helper
Was it purchased locally with cash? Or was it shipped?