Carrier/rack problems of the 2012 BMW X5

I pulled into a gas station, and as I approached the pump and put on brakes, I heard a crack. After I pumped my gas, I started my car, and a battery light came on along with an indication that there was a "charging error". I attempted to drive off, but I could not turn my steering wheel left or right. My husband looked on the hood, and noted that a belt was hanging down and fluid was spewed everywhere. My car was towed to the dealer for repair. My invoice indicates that the alternator tensioner bolt was broken that connected the alternator belt to the engine (?) and had to be repaired. This is troubling because this bolt was a replacement bolt. That is, when I had my vehicle serviced in December 2012, I was informed that there was a recall on an aluminum bolt, and my invoice from that service visit indicates that the "alternator pulley bolt" was replaced. I am troubled because the replacement bolt was supposed to address the recall issue, but the replacement bolt broke in the exact manner that the recall was supposed to prevent. I am a bit troubled that a replacement bolt, which was replaced as a result of a recall, malfunctioned. This appears to be a safety issue that wasn't addressed properly by BMW the first time.