Cancelling PT was the right thing to do here, and your OS should know what they did to you. Even if he's one that still believes in intense PT after a TKR, going against your wishes was an assault and should not be tolerated!
I will also say, just because a PT decides to do something we don't want them to do, does not mean we have to allow it. You can tell them NO! when they start to put a strap around your ankle, tell you to sit at the end of a table (I'd ask them the reason first) and any other thing they want you to do. Personally, IMHO, the very best way to handle a PT is to not allow them in your home or go to their office! No arguments, no questions, no differing opinions on how YOUR knee should recover, etc. But if you do decide to go to PT, always know ahead of any exercise or procedure exactly what it will entail, and why. That way, before starting anything, you know what it is and why they are suggesting it, and can agree or decide against it.
In the hospital, I told the PT who came in, that he would not be allowed to touch my leg or knee, except to help me lift it in and out of the bed, and I wasn't doing any exercises. All I was going to do was walk the hallways and up and down steps with his help. I stuck to my guns on that, and it wasn't open for discussion. If he couldn't accept that, he didn't have to, but it was how MY knee was going to recover and MY choice. I said it in a firm but polite manner, and refused to back down one iota.
That's how everyone needs to handle PT-it's your knee and only you decide your recovery path. You can listen to anyone you want in order to come to your decision, and then make your decision on PT or no PT. You can change your mind later if you wish, or stick with what you first decided. If you do decide go to PT it doesn't mean you leave your brain and common sense outside-you still set all boundaries and decide what you will and won't allow. And one limit should always be, no surprises. Thoroughly discuss what they plan to do, and why, and let them know your boundaries. Your boundaries are never to be crossed, unless you agree ahead of time after being fully informed. If they are crossed, then it is an assault and needs to be handled in an appropriate manner.