Clutch Pedal/linkage problems of the 2004 Nissan Xterra

Vehicle was parked in driveway. There was a slight grade that went to the street. Consumer opened the driver's side door, put left foot on the clutch, turned the key, and vehicle rolled backward. Consumer expected the vehicle to jilt forward and stall when foot was removed from the clutch , but instead, it jilted, then surged forward at 25 mph up the driveway, dragging the consumer. Consumer's hands were still on the steering wheel. The gas pedal was never depressed. Vehicle was in first gear. Vehicle crashed into the house , but the rear wheel continued to turn. Two insurance adjusters came out and inspected the damage. Dealership indicated that after the frontal repairs were performed, then they will inspect vehicle attempting to duplicate the failure to determine what caused the acceleration, and then correct the problem.