Tire Bulge Problems of Volkswagen Touareg

I purchased a set of 4 nitto motivo's for my Touareg tdi in sept 2013 at which time I had 60,000 miles on my vehicle. Today, 6/17/14, @ 75, 000 miles with 15,000 miles on the motivo's, I noticed 2 defects in 2 of my tires. The left rear tire had a huge bulge on the sidewall. . . About 3" inches across and 2" high. The right front tire had this 2" x 2" cut/gash or something on the sidewall. I immediately went to discount tire where I bought them and they said these issues were probably the result of driving over potholes and that all 4 will need to be replaced since I have an all-wheel drive vehicle and that the best they can do is give me a tread wear based credit on a new set in the amount of around $320. I paid over $1000 for your tires, which were warranted for 60,000 and I only got 15,000 out of them. And to make matters worse, it appears that the quality of the sidewall is very poor causing the defects I mentioned. I contacted nitto numerous times and they advised that they do not cover "road hazards" which they say caused the defects in my 2 tires. They also advised that since my tires were only measured as having bwtween 5/32 and 6/32 of tread wear, essentially 1/2 worn out, they only warranty their tires if they are between 1/32 and 2/32. . . Ie, totally worn out, before they would issue a pro-rated credit. This is absured!!! the warranty is for 60,000 miles. . . After just 15,000 miles, my tires are halfway worn out! I should get a credit for 75% of the cost of the tires. I would really appreciate your consideration in helping me to receive credit in the amount of 75% ($750) of the $1000 I paid for these tires, since I only have 15, 000 miles on them and the warranty is for 60,000.

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