Spare Tire problems of the 2003 Volkswagen Passat

On October 2nd, I was driving on interstate 85 in durham, north carolina when I heard a faint pop and then felt my car transfer weight from the left to the right. As I looked in my review I saw a tire without a rim rolling behind me. I merged to the left shoulder and stopped under an underpass. Upon further investigation I discovered my left rear tire tread belt had blown away from both the inner and outer side walls. The tread belt was still completely intact, making it look as if it were a donut. The inner and outer side walls had remained intact to the rim. Some minor damage to the wheel well of the vehicle had occurred. Seeing as these tires were purchased in December of 2005, and had less than 40,000 and they're rated for 80,000 miles, I believe these tires are defective and dangerous. The tire brand is goodyear triple tread assurance. Currently the car's rear tire has been replaced with a full size spare tire and will be brought back to the tire dealer tomorrow to deal with this issue.