Platform (Browser -Chrome, Firefox etc / Mini client) : Chrome
Server number : s35
Character name : Donatello
UID (Facebook account - you can find your UID on the bottom of the Facebook page, Oasis account - go to your profile page and click on your avatar) : 04773111974832573

Description of the problem you are experiencing : Wrong arena rewards, my rank was Chunin as also stated in the mail, but it contained ninja school level reward

Your computer time zone and your country : Italy GMT+1

Screenshot of the error page :