Northrop Grumman Software Engineer (Principal Engineer) interview questions

Was contacted several times by a recruiter, until I finally answered. We set up a 2-hour interview with about 4 different hiring managers. The interview took place via phone. Basic questions about my resume and things I've worked on. I thought it went well, then a few days later I get the generic "Sorry, but blah blah" email. The recruiter said to call her to get the managers' notes and recommendations. I called about 8-10 times in the next few days, NO ANSWER. Sometimes it would just ring once and go to voicemail. And she doesn't answer her email either. What a complete waste of time!! I would NEVER work for such an inconsiderate company that wastes people's time.