Unfortunately if almost every player received their prizes then there was a problem with your wifi...internet and not much can be done, it was not a bug in the game. When I know I am close to collecting a prize I slow down what I am doing...even visit a neighbour and return and then collect points to get my prize. The situation stinks..I lost a pet due to Internet problems but then I am in rural area.
All I can say is that I am sorry you did not receive the prize.
One other thing to try is delete the game and reinstall it but make sure you have dragon story or one of the games on your iPad where you can enter your user name and password.