You can only be gyarateed a a refund fo receiving the wrong item under eBay's 30 day MBG policy if you stick to the rigid timelines of a case.
You Have to open a case within 30 days of the item's last estimated date for delivery and follow the prompts and timelines thereafter.
There's no compromise here, unless you can find a friend or family member to deal with this, on the return if the case has expired, you are dealing with the seller's honesty here to refund / replace the item, nothing can be enforced through eBay.