2006 Chevrolet Cobalt cruise control problems

Dt*: the contact stated while driving 55 MPH on the highway with the cruise control engaged, the brake pedal was depressed and the vehicle lurched forward without warning. Multiple attempts were made to disengage the cruise control by constantly applying brake pressure, but the vehicle continued to accelerate. The vehicle suddenly careened through two lanes of traffic, struck a guardrail, and rolled over into an embankment where it finally came to a stop.

Tl*the contact owns 2006 chevrolet cobalt. The contact stated that when the brake pedal was engaged the vehicle stalled. The contact took the vehicle to the dealer several times, but was told that there was no code and the vehicle was functioning normally. After leaving the dealer the vehicle started to move forward and accelerate while the contact was sitting at a traffic light with the brake pedal engaged. The vehicle started to pull to the right when this occurred and abruptly made contact with a curb.