Changing bylaw after verbal approval 6 years prior

I bought my unit in South Australia 6 years and 5 months ago.

When I bought I had 2 small dogs. The unit was allowed 1 small dog. The land agent told me that it shouldn’t be an issue as everyone was easy going.

The by laws allow a small dog in unit 4 (my unit) and a bird Avery in unit 6.

I then spoke to 4 of the other owners (there are 6 units altogether) and they all said it was fine, that many other owners had kept small dogs even though it wasn’t written in the by laws.

At the strata meeting run my (Strata Data- our body corporate) I again brought it up. Again everyone said it was fine but the Strata Data person wouldn’t allow it to be on the record as it was not a meeting agenda topic.

That was over 6 years ago. I have had a falling out with one of the neighbours over an illegal dog in a newly rented unit. It was a ridgeback puppy that howled and whimpered for hours and hours when the tenant went to work. Very very annoying. Someone complained (not me) and he had to get rid of huge dog. He blames me and his friend, an owner in another unit has now mentioned that I have 2 dogs. She was one of huge people who okayed it all that time ago.

I have written permission from 4 of 6 units to keep 2 small dogs but cannot get this lady to approve. I’m hoping that the owner of unit 3 whom I have no contact details for will approve. If she doesn’t what are my choices. I believe you need a majority vote to change a by law. So 4 of 6 wouldn’t be enough as 75% is 4.5.

I also have a 17 year old cat which is purely an indoor cat that she has brought up.

Other owners had intermittently owned or looked after dogs and the lady in question has intact looked after her sons large dog. It actually jumped through her screen on her window and growled at people outside. She also had a boyfriend stay every second weekend for years and he would always bring his dog.

Sorry for the novel:

Any ideas???