Issue with free starter bundle

So I did sign up this League of Legends starter bundle on Amazon. Everything was successful until I finished signing up. I was directed to a League of Legends client download page where I have the game downloaded already. As I logged onto my account, I saw nothing occurred. Then I was stupid enough to check the bundles section of the store where I lagged as I clicked open the starter pack and accidentally PURCHASED it! Now I spend 530 RP on a ashe and useless xp boost...It was very unfortunate for me, so someone please tell me if there is anything I can do with this stupid mistake.