NCR Corporation interview questions

After an HR phone screen, a week later another HR person called. The person I talked to the week before left and they had no record of the interview being conducted. I was called in for an onsite inteview a couple of weeks later. They consisted of 4 1/2 hour interviews, and it seemed that the first two were rushed and I didn't get a chance to sell myself and the time was consumed by simple review of my past experiences. After the interviews, I e-mailed the interviews, thanking them for their time and expressing my interest. Right away, the hiring manager responded, saying that he enjoyed meeting me and ending his e-mail with "talk to you soon". After a couple of follow up e-mails and voice-mails to inquire on the position status, I finally received system-generated e-mail saying that the position was filled. I never received a reply or feedback.