As long as you received the item less than 30 days ago, if it is 'not as described' the seller has to accept a return.
In your purchased items, click on 'more actions' next to the item you want to return.
Then choose 'return item' from the dropdown menu.
Choose 'item is faulty/not as described' for the reason to return.
This opens a return case through Ebay. The seller has a few days to send a return label. If they don't, go back to the case and ask Ebay to step in.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)