Need help with game crashing

hello. a few days ago i updated my xbox 360 and i went to play borderlands 2 and now i’m having some serious issues. for one, i cannot play my dlc’s. when i try to head to flamerock refuge my game immediately crashes and tells me that the disc is unreadable, i used to get an error message but now i have the unreadable disc. i cannot go to rotgut distillery either as it does the same thing. i have gone through all the steps to re-do the xbox update, cleared the system cash and nothing seems to work. also i continuously lose my unlocked heads and skins including items from the head hunter packs. i really need help with this because i cant seem to remedy this with any known methods.