Trump is ♦.
4 card ending. Exact cards does not matter.
Declarer (South) has two trumps (nobody else has trumps), top ♥ and small ♣ in his hand
Dummy has top club, two top spades and a ♥.
East on lead plays ♥.
Obvious claim position, declarer cannot lose a trick by any normal play.
Unfortunately, there were no claim.
Declarer, very old person who forgot his glasses, trumped the ♥, played ♣ to the dummy, ♠ from the table trumped in his hand and the Ace of ♥, thinking it is the Ace of ♦.
Now opponents called a director because of revoke. How many tricks out of last 4 should be given to them?