STL Engineering interview questions

Someone called me on Friday afternoon, Monday I called them back to set up interview for Tuesday Morning. I went to the address given to me and stood at the glass door ringing the bell for 20 minutes, with no answer and no receptionist at the front door. I called the person I scheduled the interview with, and she didnt answer either. I sent her an email stating that I was there and no one was answering. She implied that I was at the wrong suite, and that they were all there waiting on me. I went to the correct suite, 1200W. That left a horrible impression to me and I was a bit frustrated by that. They were aware that I was there to interview, and no one was at the front desk waiting. I was a bit turned off by that.