Problems with 2006 Toyota Avalon VEHICLE SPEED CONTROL

Re: toyota 2006 avalon i recently bought a toyota avalon. it now has 3800 miles on it. in the second week after the purchase, i was driving on a ramp to enter a limited access high way. speed was about 50 mph as i blended in with the flow of traffic. the lane i was in started to slow down and the lane to my left had an open space. i pressed on the accelerator to gain speed and turned the steering wheel toward the left lane. the car, instead of accelerating, appeared to go into neutral, the tachometer reached almost 7000 rpm, then the transmission shifted into the passing gear and leaped forward. i almost hit the rear end of the car in front of me, but since my car had slowed down a little i was able to steer around and get into the left lane. i have gone into this detailed explanation to demonstrate the danger, and potential terrible accident at 50mph that the ??built in?? hesitation of the 2006 toyota avalon could have caused. after this experience, i went back to the dealer, got the explanation that the hesitation was normal for 2006 toyota and nothing could be done about it. i told the dealer i did not want the car and wanted my money back. of course that was refused. so i??m still driving a car i think is dangerous. i thinktoyota should make a retro fit to correct the hesitation problem. *nm