It is saturday! Guy had a trouble during non-business times and advice to make a complaint to ACCC? People who unlock accounts do not work on weekends, it is not front line of support who works all the time. What happened with giving a chance to people (which is Apple consists of) to actually do something before complaining to 4 letter agency? Also ACCC will not deal with such complaints. It says right on their home page.
I didn't see a timeline but there were indications that the author has been trying to resolve this for much longer than one day.
Regulatory agencies can forward complaints to other authorities and act based on them even if they can't resolve the particular issue for the complainant.