By mistake I sent different desktop to a buyer , he received and kept it , when contacted him he admited I refunded him the cost of the pstage in order to send it back to me , I post the right desktop to him , today he messaged me he wont be able to send back to me because he gave it to one for his birth day I checked his listing he list the processor which is i7-9700 . I tried to contact Ebay if they can help but are not reachable , any advise