Big Red VF SII wrote:
" and also did not secure the radiator cowling with the scrivets (no idea why the fascia was even removed when all they were replacing at the time was the PCV hose!). "
Here may be a reason...
Previous car and not Holden. Dropped the car off for a regular service. They decided to replace the radiator hoses. Managed to break the top hose mount on the radiator (plastic). Called me. Told me it was cracked anyway. I argued it was 100% ok and the car was only about a year old!
Anyway, I said I needed the car to go away the next day (Friday) and it was their problem.
They tried. Couldn't get a new radiator in time. None around the wreckers. They "could" get mine fixed, but not before the weekend. They called me on the Friday (car left there overnight).
All sorted! Great. I called in late on the Friday, yep radiator replaced. I asked how did they get it, They said they had borrowed a radiator from another customer's car! And that customer wasn't going to collect their car until the following Wednesday...
Maybe that's why your radiator covering was not put back correctly!