Engine Belts And Pulleys problems of the 2013 Nissan Versa

I was drviing my car on greenbelt rd, MD, and noticed s stange low noise or sputtering. . Of some ssort. I decided to stop the car. . . However car did nto stop. . . I put in park, turned engine off. . . Did not stop. . . I uesed emergency brake. . . Did not stop. . . I felt it accerelated on its own. . And had loss of brake effectiveness. I sounded the horn loudly to warn people. But the car kept going and going. I am a single mom, and my child was with me. . . For safety of life and property. . . I intentionally drove into a ditch. I felt like it was an unintentional acceleration and loss of brake effectiveness issue. I have called Nissan consumer affairs to report it, and my car is now at the dealership . I am not an expert. I need for a safety investigation into my vehicle by an independent agency other than Nissan. I am still shaken. .