Tire Sidewall problems of the 2007 Toyota Matrix

I own 2007 Toyota Matrix. 28,161 current mileage. Four (4) good year tires - eagle p205/55r/16 come with Matrix. Defective tires. Other 3 tires still looks good condition but one of the sidewall dried prematurely and the tire apart into 2 pieces while I was driving. I sent the email to contact goodyear last sat 8/27/2011. For safety reason, I would like to change different model tires. But goodyear did not reply at all. I take some pictures also.

1. We were driving down the highway at 60 mph and the car began shaking harder and harder. 2. The tire's sidewall was completely shredded on both sides, as if it were defective. 3. The tire will have to be replaced, but it is no longer under warranty as of last month.