With my former therapist, I wanted to participate in a group thing once but I was the only one showing up from the group. We decided to just use the time for a regular session for me but it wasn't really like that... we talked a lot about the group and why people may have decided not to come, then a bunch about the theoretical framework the T liked. In the end I did give a usual check to him but before I even got home, he emailed that he thought he should not charge a regular fee for that meeting and decided not to charge at all.

Never happened to me, but if the T unexpectedly needs to cut a session short, it would not be fair to charge the client. For me, I would not regard mistakes and conflicts as something that is easily defined in a general or universal way so it is probably best discussed between in therapist-client scenario. For me, I can't easily imagine a therapist screwing up throughout a whole session in talk therapy in ways that I have no control over but the EMDR thing might be a good example as that is not simply about words and conversation. I would not allow a therapist to keep forcing something upon me repeatedly though, not even theoretical ideas and interpretations. I had that issue with my former T -- he was not willing to change it, and I decided to leave because it was no longer useful, only frustrating. I did pay him in full and then just decided he was not worth my money and time anymore and stopped going.