Game gone from library

I bought battlefront a while ago when it was on sale for £20, however when I go into my library it isn't there, and when I clicked on the desktop shortcut it's asking me for an activation code. This makes no sense to me; once I bought it I played it and it ran fine. I haven't played in a month or so, and now when I try to play it simply won't work and acts like I never bought it. I have checked all my other origin accounts just in case I bought it on a different one but they don't have it either. Can anyone help? Thanks