2020 Buick Encore GX engine problems

I was driving home approx 6:00 pm as I was starting on l75 my buick 2020gx with less than 300 miles started to speed up to a very fast my brakes did not slow me down the car kept speeding up I was very scared when the car kept going faster now I am scared to drive it there was almost a crash trying to slow down

Car has less than 30 (thirty) miles on it; garaged since purchase bc of pandemic; started occasionally; battery dead when I tried to go out last week; charged battery; died again; charged again; check engine light alerted onstar, who sent email stating problems w/engine & transmission system, possible issues w/fuel management system, emissions control, misfire condition... Only 30 miles! New car! Just drove home from dealership and parked it.