How can I stop the Chairperson sabotaging sale?

My question comes with a long history.  When I bought my apartment it had a pet friendly by-law (pets allowed subject to notifying the committee), it was one of the reasons I bought into the block.

The chairperson, who has:

a) been in the block for 25 years;

b) always enjoyed a disengaged owners corp;

c) always had things their own way, and

d) clearly dislikes pets;

“refused” my application.  Unfortunately for the chair, they didn’t have the power to do so.  I then joined the committee having caught wind of the chair’s intention to put through a no-pets by law, which was attempted but shut down thanks to my own campaigning.

Since then the chair has on the surface accepted that the building isn’t anti-pet and has said as much at general meetings.

I have now put my unit on the market for sale and advertised it as pet friendly, as it’s the perfect garden apartment for animals and has a pet friendly by-law.

Unfortunately I had my first open house on the weekend and the (spineless) chair put up signs around the building’s lobby saying this building isn’t pet friendly.  Essentially he’s sabotaging my sale.  As a buyer I would be completely put off by a note like this, irrespective of whether I had a pet, as it signals underlying issues with the building’s harmony/management.

My question is in two parts:

1. What can I do right now to make this person stop during the sale campaign;

2. In my opinion this person is unfit to be chair.  My sale price reflects on the value of the rest of the building and by sabotaging me, this person is undermining all unit-holders.  It’s also unhinged conduct, not befitting of the plan’s chief decision maker. Anyone have any tips to ensure he is not re-elected?

Thanks in advance for your help.