Diversified Technical Systems Software Engineer interview questions

Had 2 different interviews. One was basic HR type stuff telling me about the company. Second phone interview was technical in nature: tech leads and engineers quizzing me about different software engineering methodologies, C++ and C# questions, some design questions, etc. They said they'd be in contact and sounded very upbeat. I thought I did very well, then SILENCE. I heard absolutely nothing back from them. After going back and forth with about 10 emails and several phone calls before the interview, they completely forgot about me. Not even the COURTESY to say I didn't get the job.