Amazon Software Development Engineer interview questions

I applied for back around the end of 2012. I got an email a few weeks later from a recruiter scheduling a technical phone interview with me at a certain time on a certain day. When the day and time came, I waited for 20 minutes and they never called or contacted me in any form. I sent them an email saying that I never got contacted by the interviewer, and I didn't get a response until nearly 24 hours later. I find this to be unprofessional, and when we tried to reschedule it, they said that a lot of the employees wouldn't be around during the time. At this time, I also had a job offer that I had really wanted, so I declined any other interviews/interview attempts with them.