Samsung Electronics America internal crack in 50" plasma from thermal expansion and warranty is not being honored Ridgefield Park, New Jersey

We bought a Samsung plasma tv with an extended 2 year warranty from a Best Buy on 2/7/11. About 4 months later we had a green line appear and Geeksquad came and fixed it but left a couple of screws out the back we later noticed. Right after that a thick white line started showing up where the green line was but it went away so we cancelled another repair. On 11/11/11 there was a thin black line going across the bottom and then it cracked right where the black line was and the picture went black and only the sound worked.We called Geeksquad and they wouldn't fix it because they said it was physical damage, basically calling us liars and told us to call Samsung. Samsung told us to send pictures and when they got back to us said it was physical damage as well. This is ridiculous since we didn't touch the tv how could it be physical damage. There isn't even a scratch on the outside of the glass, it's perfectly smooth.Samsung finally offered to pay for the parts if we pay for the labor and this is unacceptable since it's under warranty and we did not damage the tv we should not have to pay anything. We looked up consumer reports after this and have found this same thing has happened to many others. We just want samsung to make this right.