Where NOT to rent a car in England

Do NOT rent from Enterprise at Heathrow. It's not just me, if you check Trust Pilot, the reviews are abysmal. Here's my experience: the car enterprise gave me broke down in the middle of the road only a couple of hours after we rented it, was undriveable, and needed to be towed. We were then stranded in the middle of two lanes of traffic in each direction for over nine hours, well into the middle of the night. I made many, many calls saying we needed help immediately, and yet we were only told by Enterprise that we could not leave the car or it would not be covered. We did not get a new rental car the next day, and after being told that one would be delivered where we were staying, it was not, and we had to go 45 minutes away to pick up another one. When I returned the replacement car, I was told that I would get a refund, I only needed to fill out a form that would be emailed to me. That email never came. I was promised to get it by the end of the day but it never came. The only people working at Enterprise who seemed at all helpful or to care about our plight in the least were people who made promises that they did not keep. Have made multiple calls, chatbot convos, etc, and have been told multiple times that my concern has been "escalated" and that I would hear back. I have still never heard back.