All answers
I got the wrong item.
Start a return and pick the reason that says the item was not the one you won. That puts it down a different path from an item that simply disappointed you.
Worth knowing: Do not use it, alter it, or take it apart first. We check the item against what the listing said, and that gets harder once it has been handled.
Bring it back to the warehouse you collected it from, within the return window, and send us a message if what you received belongs to somebody else.