You'll probably be charged for the whole thing.
I would contact a game advisor and ask (you can also ask for a refund and then buy the whole thing if it will): http://eahelp.ea.com/en/ . For help with navigating the site, see this: http://answers.ea.com/t5/Beta-Archive/How-to-contact-a-Game-Advisor-using-the-new-EA-Help-page/m-p/2161281
