I did not open an INAD case just sent them back by return post (Postage paid already) to seller.

Tracking on ebay shows returned to seller and refund paid.  But refund not paid only a transaction on my CC saying $18.16 AUD from ebay as the description but actual funds deposited was nil.  The amount $18.16 was my purchase price less postage - amount seems about right I just have not got it but ebay thinks I have.