Car Accelerates On Its Own problems of the 2016 Chevrolet Equinox

Unintended acceleration!! while driving on the freeway at 70 mph without the cruise the vehicle suddenly was under full acceleration. My wife immediately asked "what is happening". My first reaction was to apply the brake which caused the acceleration to cease. I then called onstar to report the problem and they responded that my tire pressures are ok and no codes were detected. I took it to the dealership where I purchased it and they checked for codes, drove it , inspected and could not find a problem. I called customer survice and was basically told there was nothing they could do because there was "no trouble found". This car had less than 900 miles when this problem occurred. I am a former final assembly electronics test engineer for delphi and know how sofware problems can be difficult to diagnose. I know what I experienced and for gm to ignore this safety problem because a service tech did not recover a trouble code or be able to repeat the problem in a 45 mile test drive simply infuriates me. What would happen if the vehicle decided to accelerate while waitinf for a light to change at a busy intersection?.