Advanced Technology & Research Junior Computer Scientist interview questions

Called HR to schedule an interview. Scheduled it for the next day at 1030 with the hr rep. She decided to choose another time that I was unsble to do, even though we discussed a different time 30 before the confirmation email. Upon finding this out I emailed my interviewer as well as called HR and left a voicemail, becuase Im guessing she decided to leave work early even though we spoke an hour before. But after doing both, i never heard back from either after telling them they gave me the wrong time. Very unprofessional.