I thought I was making progress in getting this fixed but I am now not so sure.

Feel free to call VicRoads on 133 778. At the prompt say “Seeking update on enquiry”
Use reference number 503757816
Tell them that this is VERY dangerous, it is the intersection of a major road and very busy train station. It has been like it for months.
They really struggle to comprehend that the entire sign is missing.
As call centres go they are very quick – takes less than ten minutes