Don’t fight the OC, fight your landlord.
You have the right to peaceful enjoyement of your unit under your lease.
Write to the landlord ( so you have a record).
Tell him you are going to Fair Trading or whoever adjudicates leasing disputes in your state, and will be seeking a rental reduction for the period of the inconvenience.
The landlord, seeing his income decreasing should get onto the OC and get the appropriate action.
Your voice as a tenant holds little sway with the OC.
Let the landlord do the heavy lifting.