Tire Sidewall problems of the 2013 Volkswagen Passat

Primewell valera touring ii 215/55r 17 tires. The tires after 5000 miles have developed a roaring sound and the sidewalls are cracked. The roaring has become so loud I had the wheel bearings replaced because of the noise. The noise is in fact coming from the tires. The tires were bought by the dealer we purchased the car from. In fact, it was part of the deal that the car had new tires put on. Because of this fact, the tires are not under warranty. I took the car to my local firestone dealer, they have primewell tires made exclusively for them. The dealer was nice enough and told me about the recall for the tires, but my specific size was not listed under the recall. The next size up and down were listed, but not our specific size. He did offer a discount on a new set of tires though. He honestly tried to help us out. Before I spent an additional $500 plus dollars I called firestone corporate. After stating my case, he said there was absolutely nothing he could do. I asked him if he would let his wife drive a car with cracked sidewall tires, he commented if it was his car, he would get them replaced, but he offered absolutely no help to do so and was unapologetic to say the least. I expect more from firestone / bridgestone. You would think after all the bad press from the Ford explorer tire incident they would back there products up better, or at least offer a product that lasts longer than 5000 miles. Please be aware before buying there products, I know I never will again!.