Galaxy III Gorilla Glass defective

Used my Galaxy S III in bright light at a grocery store. Was safe in my inner coat vest pocket until an hour later at home in bad light noticed what appeared to be a little crud or something under the hard button. Tried to scrap it off with my thumbnail...tried harder...puzzled went over in better light was shocked to see it was shattered. Phone was not dropped and nothing impacted the phone other than my thumb. I'm right-handed, my thumb presses the hard button down and to the left...the left 3/4 of the several mm wide strip is where the "crud" appeared which turned out to be disintergrated glass. After I noticed what appeared to be crud I did impact the area with my thumbnail trying to remove it.

From my initial contact with Samsung up through Rosa Gonzales, Sr. Executive Customer Relations, Samsung DENIES that the Galaxy S III has Corning Gorilla Glass. Of course glass failing like this is simply not fit for use under implied warranties regardless of express warranties and regardless what the glass is called.

Who is this "Hankil Yoon, Senior Vice President of Global Product Strategy at Samsung Electronics" quoted by tech journalists all of the web and why is he the only person at Samsung who thinks the Galaxy S III has Gorilla Glass?

Samsung refuses to fix the phone, and is charging me $70. Because Samsung is not taking ownership of the problem and is disavowing the press releases of "Hankil Yoon, Senior Vice President of Global Product Strategy at Samsung Electronics" I can have no confidence that the phone I receive back will not have the same defective batch of glass, nor can I have confidence that Samsung will stand by any of its future products. Some Samsung executive has decided to avoid responsibility because the cost of fixing the defective glass is more measurable than customer retention.