Criminals have a tendency to use unsecured wireless networks for downloading illegal content. You're lucky it was just movies and games.
Many criminals go after financial information. Even worse, some perverts roam for unsecured Wi-Fi networks to download child porn. If you think losing your Internet connection is a pain, imagine federal agents showing up on your doorstep.
This is exactly why I urge people to secure their wireless networks. It only takes a minute, but can prevent trouble like this.
What's done is done, however. So, what can you do now that your ISP terminated your service? The answer, unfortunately, is not much.