AppleCare broke my Macbook

I sent my Macbook in to have the optical drive repaired, Apple called me, told my display was damaged and it would be close to $800 to repair it. I told them I didn't have a damaged display, after arguing back and forth about how my display wasn't damaged I told them to send it back.

Once I received it, the display was in fact damaged, horribly. I called Apple they said tough luck, not their fault, they'd being willing to pay 50%. They asked if I had proof, I told them why would I take pictures of my computer's display when I was sending it in to have the optical drive replaced under AppleCare. Please help, very frustrated.