I agree with Scotty.
I expect there is a mechanism by which the OC could require a general meeting to be called. In the ACT, a petition by 25% of owners stating the matter to be decided can require the committee to call a general meeting. You could put a motion: ‘that the fences enclosing the areas of common property be removed by the relevant unit owners by some date that gives them ample time and that if the fences are not removed by that date, the reasonable costs incurred by the OC for doing so be billed to the relevant unit owners.’
If they comply, that’s great and it cost you little. If they don’t comply, then the committee is obliged to act in accordance with the resolution. If the committee does not comply due to its composition, then your hand is strengthened when you go to the Tribunal seeking an order that the committee be compelled to carry out the valid direction of the OC.
I suggest that you demonstrate that you have the numbers with a petition for a general meeting having more than 50%. By showing you mean business and have a mechanism to compel compliance you might get compliance without having to go through with it.