I was invited to the initial call via email, asking me to book a time slot. I selected a time slot, and sometime before the meeting, I received an email about changing the time slot. Of course, it may be necessary to change the meeting time. However, even though I requested a new time slot link via email, and I also sent a second email in case the first one did not arrive, I haven't received any messages back. HR completely ghosted me. This kind of approach is very disrespectful.