multiple unit purchases reducing the voting power in a small apartment block

We have a block of what was originally 15 apartments.  One owner purchased what was to be three x two bedroom apartments  and  turned the lots into one large penthouse and made it  clear that it was written in their contract (I assume with the developer) that they would be entitled to three votes as they had effectively purchased three  apartments.   Now I can understand the entitlement but as they have strong relationships with 5 other apartment  owners  the rest of us never can win on a vote.  Does anyone know if there is any law or similar that says once it becomes one apartment it becomes one vote?  I have a three bedroom apartment and a two bedroom has the same voting power as me.  Just thought I would ask rather than just wonder.  Regards Chatterbox