HDR Executive Assistant interview questions

It was very simple, someone had reached out to me from their corporate HR and had a preliminary interview with me. She scheduled an on-phone interview with the CEO and the HR representative in Arlington. It went well and they scheduled an in-person interview. I had an interview with them in person, and they said they liked my questions and that they would call me in a couple of days. Never came. They never called me back, never sent me an email, never heard from them again. I even followed up with them and sent them thank you emails, and asked about the process, and no response whatsoever. I was very disappointed to say the least, especially because I thought it went so well and how unprofessional it was they never responded or even told me they moved on.