Yang-
My guess is that you are not the only one who is having a bad experience with the receptionists. Telling your T about your experience with them and their hostility will not only help you, but also help the other clients. My guess is that other clients feel like you and are hesitant to tell their Ts about their experiences. I worked as support staff at a hospital. The receptionists were polite and welcoming no matter what was going on. That is part of their job description. You are not a tattle-tale because you are speaking up for yourself. Your T will want to know that your experience with her receptionists is impacting your ability to work with her in session. She may never have told them, expecting them to believe you, that you could schedule more sessions. So she may need to tell them herself, and if she has already told them, need to tell them again.

I know I have a very hard time speaking up for myself when I am being treated incorrectly. I also have the voice of "don't be a tattle-tale" going through my head. My guess is that you have a hard time speaking up for yourself in other situations also, otherwise you would have spoken up before this. Think of this as practice for other times in your life when you need to speak up for yourself. Your T is not going to be mad at you. And your T will not tell the receptionists that it was you who let the Ts in the practice know that they were not doing their job.

If I had employees who were not doing their job (especially if they had contact with the public) I would hope that someone would tell me so that it could be addressed. Their behavior reflects on the practice.

You deserve to be respected and that is not happening.