Hm, to have a manufacturer/dealer recommend you drive around a dangerous vehicle to trouble shoot a known issue is just mind boggling.
That is, to have you drive around and risk the life of yourself and other road users in the hope that the power steering cuts out and a fault code is logged, just so the dealer service department can check a code in the safety of their workshop, is simply beyond belief, on multiple fronts...
So if you haven't already done so, it might be worth reading the 'ACCC undertaking' where Holden has agreed not to represent that Holden has the discretion to determine a remedy. Put another way, Holden had undertaken to follow the law which can only mean that if you choose a refund for a major fault, they can't object. May be Holden can try and argue whether the issue you have experianced is a major or minor fault but that's all they can do. They can't force you to accept a repair when you want a refund for a major fault and even blind Fredy would understand an intermittent failling power steering can only be considered a major fault and a huge safety concern.
So i'd give each of DOTARS, the ACCC and your State Consumer Affairs body another round of calls and update them as to Holdens response. ACCC may especially be interested in Holdens responce, as what they said to you indicates they seem not to be following their undertaking to ACCC. Possibly suggest to ACCC that they could use your situation as a test to determine how well Holden follows the law and their undertaking to ACCC... Between ACCC and Consumer Affairs, they should be able to guide you in your claim to get your remedy of choice and how to document and request it.
Sadly, Holden Customer Care will promise to call back but is they usually fail to deliver on such promises. As such, i'd say it may be time to formally place your demands on Holden in writing.
So with ACCC/CA guidance, document all your contacts with the dealer/Holden, date & time, and their unacceptable responces to this major fault you have experianced with your vehicle to date. State your chosen remedy is a full refund of purchase price as afforded within the ACL. Give them one week to respond to your remedy.
If the week has come and gone, then consider lodging a claim with the small claims court in your state (small cost to do so) but hopefully Holden will see some sence in how badly they are handling this and sort it out. If not, the judge will decide one way or another (but usually they follow the law and may not be impressed with Holden draging its feet in hollowing the ACCC undertaking they agreed to follow.
Oh, and if you can, garage/park your unsafe car and don't use it as it looks odd for you to be driving what you describe unsafe.
Don't give up and keep on pushing.
