Automatic Transmission problems of the 2009 Dodge Avenger

I have a 2009 Dodge Avenger that is operating unsafely. It continues to maintain its speed when I take my foot off of the accelerator, and doesn't slow until I press on the brakes! it also to lurches forward when automatically downshifting, causing me to brake even harder with near misses in all of these situations. I initially worked with la mesa Dodge dealership, where I purchased the car, but after several months, poor cust svc and no resolution, I took the vehicle to hine Dodge in mission valley, CA. The service mgr and svc advisors have driven the vehicle. All verbally admitted that they experienced the situations I described above. The vehicle operation was recorded and sent to a Chrysler service rep, who replied the "vehicle operates as designed. " although the svc advisors/mgr has verbally described their experience to me, they have not documented anything on the service sheet. I have verbally stated many times that this vehicle "is unsafe to drive" and the serviceman have also verbally told me they agree "it is unsafe to drive" yet I am expected to pick it up without resolution. I am dropping the car off tomorrow, and will not pick it up from the dealer until the issue is resolve. Enough is enough!! I am tired of driving an unsafe vehicle, and putting myself and my loved ones in harms way. What are my rights as a consumer to get the accurate documentation on service sheets? I am hoping that the last "recordings" taken last week will actually provide some evidence of the "unsafe operation" of the vehicle, but my ongoing negative experience leaves me worried, and leery that the Chrysler corporation will acknowledge this serious problem. The transmission was completely replaced in 2010, and the problem became worse, and more frequent. I am constantly having near miss accidents when taking my foot off the accelerator, and the car does not slow down, and then when braking, it accelerates when downshifting. Please help. I am exhausted and need advi.