Maybe I don’t know the full circumstances, but can’t you just get a refund on it from the club? Don’t know if it’s the same, but for league games they accept returns up until 30mins before the match and you can normally cancel a ticket by phone for a refund if you can’t get to the club.
In any case there’s still loads of tickets on sale for the game so I can see why you’re not getting much joy on here.