Relevant billing fault data withheld from the arbitration process 

A kangaroo court (see Kangaroo court - Wikipedia) is a judicial tribunal or assembly that blatantly disregards recognized standards of law or justice, and often carries little or no official standing in the territory within which it resides. The term may also apply to a court held by a legitimate judicial authority who intentionally disregards the court's legal or ethical obligations.

A kangaroo court is often held to give the appearance of a fair and just trial, even though the verdict has in reality already been decided before the trial has begun. This could be because of the biases of the decision-maker, or because the structure and operation of the forum result in an inferior brand of adjudication. A common example of this is when institutional disputants ("repeat players") have excessive and unfair structural advantages over individual disputants ("one-shot players").

The statement made on Kangaroo court - Wikipedia "...that a kangaroo court is often held to give the appearance of a fair and just trial, even though the verdict has in reality already been decided before the trial has begun",  is exactly what happened during the various Casualties of Telstra (COT for short) arbitrations i.e. the arbitrator and the Telecommunications Industry Ombudsman (TIO) collaborated with the defendants (Telstra) to conceal relevant information from being investigated.

Being aware of the problem is severe enough. Still, not assessing the damage these billing faults caused due to a two-fold problem where this billing fault caused the customer's service lines to remain open affecting incoming calls to connect was criminal