I was invited three times to go to the Ivanti's office in Bracknell to have three 1:1 interviews, between December and January. Since the last interview mid January, I have heard nothing at all from Ivanti, despite having asked their internal recruiter twice to give me an update.
I think that such behavior is definitely rude and unprofessional.
I think that it's perfectly reasonable for a candidate who took the time to visit Ivanti's office three times to expect a feedback/update in relation to the application, whatever such feedback/update may be.
Definitely one of the worse interview processes I experienced in my life.