If it was an Alpha 40 trainer, I would suspect that when the wing haves were joined that either the wrong kind of epoxy was used or not enough of it was used. I personally have an Alpha 40 trainer and have beat the wings to death(pilot stations mostly) and they are still straight and true. If you are sure you assembled the wing exactly as the instructions said. Then send the wing to Hanger 9 ( Horizon Hobbies) and see if they will give you any comp.

Good luck
Tey