Ask them to open a return on ebay and they will receive a paid-for postage label to send it back to you. That will cancel and refund the transaction so you should relist the correct item for them to buy again.
Thank you, I appreciate your help. So that would be an ´item not as described’ request and will get it returned to me. Does it generate a full refund too or do I need to instigate that separately? Thanks again Simwe
Yes, using "not as described" will mean they get a paid-for return label. Wait to get the item back first and then issue a full refund via the return case.
