Nielsen Client Services Manager interview questions

I did a phone interview and then was asked to take the online assessment test. It was mostly logic type questions followed by a personality test. I learned I had passed this test and then was asked to do a phone interview with the hiring manager. After the second phone interview, I went in and meet the person who would be my direct boss and the executive Vice President. I was given every indication that I was a top candidate. Surprisingly, after the interview I never heard back from HR or the hiring manager despite my attempts to follow up. Very unprofessional process.