My department delayed my viva and is being unprofessional. Should I report this?
Complaining about this won't speed up your defense or get your thesis to your committee any faster. It will just make you disliked within your department. Accept the loss of time, do your defense, get your degree, and start your next job. Unless there are specific rules against doing so, take the lesson that when getting your thesis to your committee and scheduling your defense date, no administrator will ever take the issue as seriously as you. So instead of delegating something you care a lot about to someone who doesn't care at all about this task, you could do these tasks yourself and get them done under a timescale you like.