When you receive the wrongly dispatched item, you open a case for item not as described.... Item Does Not Match Description or Photos.
The seller then has 3 days to accept the case and pay for the return postage label. You post it back, and the seller has 48 hours to refund you. If they don't for whatever reason, you escalate the case, eBay step in and force the refund.
Meanwhile they should send you the correct item.
@securepackings