«Mates rates» is a big problem in Australia, indeed. At best, it is collusion, but typically it is corruption.
I have recently gone through the entire chain of complaints, the ombudsman including, and I have gained plenty of insight into how insidious the current scheme is.
NSW has set out to do something about it, with price caps being introduced in 2027. If you live in NSW, make your submission to the regulator (IPART) ASAP – submissions are closing at the end of July.