As others have said, your issue is with the product and not the seller. You admit that you thought it was junk before you bought it. Cheap Chinese goods seem to be all the rage these days. If the listing was deceptive, that's a different thing. You lost that angle when you admitted to knowing it was junk beforehand.
I'm not picking on you, though. Thanks for caring about other buyers enough to try and warn them. It's just not helpful to buy for the purpose of criticizing someone for the product they are selling. You can certainly say that the item was junk. It's just the seller rating part where there's a disconnect. You got what you bought and you got it on time. You don't want your money back. You seem to be saying the "product" you were really buying is criticism. That's not what's for sale.
