If you really want a refund then you can contact an Advisor and report that you have been unable to play the game. Click the following link to get started: http://help.ea.com/en/contact-us/new/?category=demo-beta
For help on how to contact an Advisor please use this link: http://answers.ea.com/t5/EA-Help-Beta/How-to-contact-a-Game-Advisor-using-the-new-EA-Help-page/td-p/...
Having said that, it may be worthwhile to try a little troubleshooting:
Also, try power cycling your router.