Seller returned box with Amazon Warehouse Sticker, wasn’t what I sent

Buyer starts not as described return because faucet doesn’t have a feature it expressly states it doesn’t.

Get return back and it’s not the unit I sent. Different box and has an Amazon Warehouse Sticker on it. Seems clear to me they bought my new one and a cheaper Amazon used unit and are doing a switch-a-roo on me.

I know I should just accept and avoid ODR issues. Anyone have a better outcome on a similar issue?