[Client] I bought two champions and they're gone.

I'm a new player in league. And after i finished a match about almost two hours ago, i bought two champions. Lee sin and Nunu. And I logged off. Then I logged back in and i played a game and they're not there. After I finished the game i Checked my collection and those two champions I bought was not owned. Aaaaaaaand All of my Blue Essence is gone