I think the first thing to do is contact the transport company/driver and explain how you feel about being left in the present situation and discuss options how the problem can be resolved to your mutual satisfaction/cost.
You should give the transport driver the option to relocate the building to where it was originally agreed he was to place it... at his expense.
If the driver is unable or unwilling to perform that work, try and get an agreement in writing with him that he pays for another company (sounds like a crane job) to perform the work.
Determinations of this type can be handled by a civil administrative tribunal, but they can take a while to be heard and the first thing they'll advise you to do is try and come to an agreement without mediation or if that fails, a hearing.
I'm not familiar with the WA equivalent, but it's not an expensive process in the eastern states.... just time consuming.
Hopefully you have a written agreement/contract with the transport company/driver for the original work that was to be undertaken.
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