I agree with what Jimmy says about making an enemy for life.
If you obtain a copy of the plans for the complex and they denote the Visitor Parking as Visitor Parking then this was a condition of the Development Approval process and these bays CANNOT be used for anything other than VP (without council approval).
It dosn’t matter what the bylaws say, or what motions have been approved granting permission to use the VP they are all irrevelant as they conflict with a higher law the council Development Approval and so are illegal.
The EC should be issueing a NTC to both offenders ASAP and then they can be hit with fines of up to $550 or go the concillation and adjudication route and then the fines are up to $5500.
The rubbish is not so cut and dried but if you have a majourity on the EC or OC you can do something about it.