Was in a minor accident with their insured. Had to...

Was in a minor accident with their insured. Had to extend my car rental because my vehicle was not ready to be picked up. Now ACCC says they did not cause the delay in my vehicle being repaired and now want me to pay for 3 extra days for a rental.
Auto repair facility said the subcontractor used to pick up the part that needed to be repaired could not pick up the part because the vehicle was in paint and to move the vehicle would have risked ruining the paint job. The repair facility and I both have tried numerous times to file a supplement with ACCC explaining the reason for the 3 extra days of rental. ACCC still claims the delay was not their fault and thus, they will not pay for the extra rental that carried over into the weekend!
So, I the innocent one, has to pay $135 to the auto rental place or it will hit my credit!
ACCC is horrible and I will be writing the state insurance board as I have names, dates and times I spoke to people and the attempts to call, leave a message and never called back.
ACCC is a buyer beware, or in this case, accident beware insurance company.