Cargill Research Assistant interview questions

I was called by a recruiter in HR and a phone interview was set up with the recruiter and the hiring manager for the position. We talked for about 45 minutes going over my research experience, what the job would be, and the Cargill atmosphere. I followed up with both the recruiter and the hiring manager about two weeks later by calling and leaving a voice message (no access to their email addresses). Neither one of them called or emailed me back, even though they had my information. I never heard from either of them about the position after that interview, which I found very unprofessional.