Vsa Warning Light On problems of the 2011 GMC Yukon

I was on the highway driving through boston in the fast lane, going about 70mph when all of a sudden the stability control light came on with the check engine light and the engine reduced power light and my vehicle totally lost power to the gas pedal. I was able to get into the slow lane but my vehicle was not able to go faster than 35mph and there was hardly power to my gas pedal. Luckily, I made it to an off ramp, as I started to come to a stop, the engine was running very rough and it felt like it was shaking the vehicle back and forth. I barely made it into a empty parking lot and shut the engine off. I managed to make it to my mechanic, who got a throttle sensor code from the engine. He told me about a special coverage adjustment #12273b from GMC, regarding this exact issue and told me to take it to GMC. GMC told me, my vehicle isn't listed for this adjustment, even though, it says it should cover 2008-20111 GMC Yukons. Apparently, GMC said my VIN isn't listed as having the faulty part. I almost died this morning in the fast lane in boston with the exact problem GMC describes in the 12273b. GMC said I'm not covered and have to pay out of pocket. Obsurd.