@jckl1957 wrote:

 

So, you were liable for the refund but can try to claim for the cost of the item from Royal Mail.  (Through Packlink if you bought the label through Ebay.)


Royal Mail isn't through Packlink.  The purchase/agreemrnt is directly with Royal Mail, as per these terms:

 

https://www.royalmail.com/parcel-despatch-low/business-advice/ebay-terms-and-conditions