Calling the Twenty: Puzzle M10

CTT-M10 Puzzle

Everyone passed; the Forehand, P1, plays the Call, calls the XX, which you do not hold, and announces Pagat Ultimo. You are P3. Your hand: Skus, XXI, XIV, XII, X, VIII, VI, V, Jclubs, 1diamonds.

P2Defender
10 cards

Pass

P1Forehand, Declarer
10 cards
P4Defender
10 cards

Pass

Your hand

SkusTarok XXITarok XIVTarok XIITarok XTarok VIIITarok VITarok VJack of ClubsOne of Diamonds

Do you say Kontra against the Pagat Ultimo? You kontra only an item you can be sure must fail.