Brake Grinding Noise problems of the 2010 Nissan Frontier

On December 7, 2013, I began to hear a grinding noise when I applied my brakes. I phoned the nearest and was given a service appointment for Thursday December 12th. I was given an estimate of $18. 95 for a brake inspection, if my vehicle warranty no longer covered the repair. On Wednesday, December 11th, I was told to do an inspection in case there was a stone or piece of gravel which could easily be removed without a repair service by Nissan. I removed the right front wheel and noticed that the outside brake pad looked almost new, but the inside brake pad was totally ground down to the metal backing plate. Nissan said the front brakes would probably have to be replaced and that repair would cost me $189. 95. On December 12th, I drove my 2010 Nissan Frontier to modern Nissan at 9:00 am. My brother had followed me in his vehicle to make sure I arrived there safely. Around 10:30 am, I received a phone call from modern Nissan and I was told that both front-inside brake pads were worn metal-to-metal and the brake rotors would have to be replaced with the new brake pads. He said my estimate was now $289. 95. Around 1:30 pm, I was given my “final bill” and it totaled $354. 91. I was very upset at having to pay for new brake parts with only 9,323 vehicle miles. I have (two) 2-car garages and my truck had never been parked outside overnight since I purchased it new in 2010. They also stated that the brake calipers were found to have been installed improperly, because the brake fluid lines were twisted backwards. I informed them the wheels & lug nuts had never been removed until I was instructed to do so before bringing my vehicle in for the repairs. I should not have to pay for any repairs with less than 10,000 miles on a new vehicle purchase.