Halo 4 Language Stuck In Japanese

Hi, I recently purchased a second-hand copy of Halo 4 for the Xbox 360, and played a bit of the campaign. Mission 4 wasn’t loading correctly so I cleaned the disk and installed the game onto my hard drive. When I booted it up again, everything worked perfectly… except for the game audio being in Japanese. I have tried changing my region and default language on the console to no avail. Does anyone know how to change it back to English?