I am so sorry for your loss. You gave that vet's office an appropriate review, IMO.
Years ago, we had a yellow lab, Bluto, who was going downhill fast, and was paralyzed with arthritis that had gone to his spine when we got home one day - on a Sunday. My regular vet was out of town, so I called the father of one of my students, who was also a vet. I apologized for calling him, especially on a Sunday, and he insisted that I bring Bluto to his office. Once examined, he agreed that it was "time", and he was so kind - we even got a condolence card later.
Thankfully, most vets I've known are like this, and I've had to have several pets sent to the Rainbow Bridge over the years. I'm so sorry you had a bad experience with your beloved cat.