Certainly not professionally handled. Would it cause me to change T's? That would really depend on how the relationship with this T had been going otherwise. If the T has otherwise always behaved professionally, our ability to work together had been going well, etc., I would certainly need more explanation and some compensation for my time, but I could probably get past it and continue forward with the T.

On the other hand, if this was just one more problem in an already ineffective therapy relationship, this would probably be the straw that broke the camel's back. You just have to decide where on that continuum things are with this T.

I hope you will advocate for more explanation and some natural compensation such as a free session or so.