Reffered by fellow employee, did two 30 minute phone interview, followed by a one on one meeting with my future supervisor and coworker. Around 2 weeks later an offer was made to me and I accepted.

I was contacted via email by HR. I was asked to set a telephone interview. I scheduled an interview. On the day of the telephone interview, I prepared and waited. After 1 hour of waiting for the interview call, I sent an email, no response. I sent another email the next day, no response. A week later, I sent another email and still no response. I found it very unprofessional.