Cruise Control problems of the 2018 Jeep Renegade

Jeep stopped accelerating on the interstate going 75 on cruise control; we were in the passing line with semi trucks behind us so we has nothing choice but to pull over to the left shoulder until we could safely move the car to the right shoulder. Car continued to run, but would not accelerate. No check engine light. Car was towed to a dealership, diagnostic did not show any issues; I was told that it happened because it was hot and because I drove it more than 5 hours. Jeep is stuck 12 hrs from where I live and there are no parts available. Manufacturer and dealership refuse to give me a loaner car.