You don't have to. Complete the process on ebay. Go to More Actions, far right of item on your My eBay Purchase History page and click on Return this item > Doesn't match description. Or go to Resolution Centre, very bottom of any page and click on "I received an item that does not match the seller's description".
If the seller does not accept it you will be able to escalate it to ebay after 8/9 days, and they will be required to issue a return postage label for you to use.
