NHTSA Complaint #11463428 — 2020 GMC TERRAIN

I had been fishing at the lake and went to leave and when I got in my car I put it in reverse and backed up then put in drive to pull forward, only I pushed the throttle all the way to the floor and the vehicle was completely unresponsive. I put it back in reverse and backed up a little more then put back in drive and same thing happened. I then put it in neutral and have it gas and with the pedal to the floor it barely revved the engine at all. I put it back in drive and floored it again and started turning the when from side to side still nothing. I put it in park then back in drive and with the gas pedal to the floor it barely started to creep forward. It continued to creep for about 40ft then all of a sudden the throttle worked and vehicle jerked forward. 2 days later I was driving in town with my daughter in the car and slowed down before turning up a steep hill and the vehicle did the same thing. Gas pedal to the floor and wouldn't accelerate. Only this time I almost got rear ended. I have contacted the dealer and told them I need a loaner while my vehicle is fixed and their response was "I don't know what to tell you we don't have any". I called GM and they said they would contact the dealer and see if they just don't have any loaners available or of they don't offer them and said they would call me back. The end of the next day I still haven't heard from them so I reach out to them again this time being told "an owning advisor has already handled your claim, sorry you haven't been updated yet". I don't need updates, I need a safe vehicle for me and my kids! My car has only 57XXX miles plus I bought a 100,000 extended warranty. Please hold GM accountable for their poor quality of vehicles and even worse customer service!