Ah that sucks dude, sorry to hear that. It's actually one of my biggest fears when I look at the more expensive items in my backlog.Check your discs!
It's so easy to buy something, and leave it in the cellophane for when you next have time. You can have unwatched discs stretching back years!
I bought the 20th Century Boys trilogy, telling myself I'll get around to watching it when I have time. And yesterday, got to movie three, and it died after the layer change. Freezing, chugging, pixellating and dying on all my players.
Now 4 Digital Asia, who released the boxset don't exist anymore, although4 Digital Media still does. I doubt they'll be offering any replacement discs, and neither will the store I bought it from... Play.com way back in 2010.