First email came through a secured channel where I had to register myself in order to see the email. Once I replied choosing between the 2 offered appointments, they ghosted me. I had to email them again to follow-up, when they finally provided a link for the hiring manager interview. After the interview, they ghosted me again -> followed up again. Never heard back since.

Provided my availability for interview. Internal TA arranged to call me - but never did. I followed up, eventually a few weeks later they asked for more availability, which I provided. Again, they never rung me. I sent numerous emails and voicemails following up, then I never heard any more. Totally ignored - having been told they were interested in my application. Don't arrange interviews that you're not going to conduct. If you've filled the role, or pulled the role, or whatever, communicate!