Hey,
I totally agree with TechZilla. You should definitely collect a lot of evidence to prove that you didn't drop your phone. Maybe even make a video showing all around the phone. Samsung loves to avoid doing repairs. They wouldn't fix my TV because I wiped the screen down, and that apparently voids the warranty even though it wasn't a screen problem. If you got the phone from a network provider, they might be more helpful. Just make sure you really emphasize to them that Samsung won't repair a phone directly if you didn't buy it from them. And if you bought the phone from Samsung, well, good luck. They're pretty useless and use foreign agents that don't actually know what they're saying, it's all on scripts.