TechMD interview questions

I set up an interview with TechMD and scheduled a time that was open on the HR representatives calendar. I received confirmation for the interview via email that same day. Once the time for the interview started, I joined the meeting early. I waited for the HR rep to let me in to the meeting room, however, even 30 minutes in to our scheduled meeting time I was not let in. The meeting ended automatically after 30 minutes and I have not heard anything. I reached out via email to the HR rep and have not heard anything back. I understand that things may come up throughout the work day, however I do think that not communicating with a person you agreed to interview is very disrespectful.