PCL Construction Proofreader interview questions

I was selected by the employer for an interview. I confirmed my interest. They assigned an online interview the same day without asking me about my availability. We rescheduled for the next available day, a Saturday. HR provided that day. No one came online, either on the time zone given me or on my own time zone. They were a no-show. I emailed them asking if they wanted to reschedule. They did not respond. Very unprofessional behavior.