2006 Nissan Maxima steering problems

Dt*: the contact stated on reversing the vehicle out of a parking space, the front end was not clear of the curb. When drive was engaged and the accelerator was depressed, the front left bounced over the curb. As this happened, a metallic bang was heard, then the vehicle accelerated forward out of control. The steering would not respond and the vehicle drove over another curb knocked down a sign post and then on impact of a stone pillar, causing all airbags to deploy.

I was first told that the cataylic converter was gone, had that replaced, then was told 2 motor mounts were gone, had them replaced and still have the same problem, with the car jerking with a hard knock into 1 and 2nd gear and now it is accelerating while driving and jerking into gear. Nissan needs to recall the transmission on these 2006 maximas there are so people having the same problem.