You may get a refund but you might have to pay and bear the cost of return postage,like I did as below.
I had an ebay transaction where the items were faulty and not fit for purpose.
I returned the items and got a full refund,BUT I had to pay return postage of £3:80.
Tried to open a claim with ebay for the return postage cost but the dispute was closed by them when I had the full refund returned to my Paypal account.
Ebay state you can recover retun postage costs if the goods are faulty or not as described,but it's difficult to find how to go about it and you have a limited time to make a claim.
Buying anything second hand off ebay is a bit of a gamble at times but you need to ask questions before buying/bidding to be certain the item is in working order.
LESSON LEARNED and £3:80 out of pocket due to a slimey seller.