Re-wiring of units NSW

I live in a 1920’s block of 21 units.

We are in the midst of some major electrical work and now the Strata Manager has advised that the OC is responsible for the re-wiring of all units, and a special levy has been raised.

Myself and at least one other unit owner have already had our units re-wired which we paid for as we assumed that this would be an owner responsibility and now we are being asked to contribute to the cost of re-wiring all units.

We think that this is grossly unfair – apparently the Strata Manager believes that this is an OC responsibility because the meter boxes are on common property and the cables run through some common property walls.

Is there anything that I can do to avoid having to pay agin.