I take it you opened a "not received" case. It should have been a "not as described" return and you can still do that. Click on "Return this item" on right of your order on your Purchases page and select "Doesn't match description" as the reason. If necessary escalate it to ebay after 3 working days. You will be issued with a paid-for return postage label.
The seller will also have the option to issue a partial refund without return or send the missing items but don't close the case before they do. And if they delay be sure to escalate your case within 30 days.
