This is not a strata issue
What you are seeking is damages for the trimming of the shrubs, which is a civil matter.
You mention thst replacement trees are $3200. You have to consider thst to clsim these damages you would need to go to court , unless of course the aOC admitted guilt and paid you out. If you go to a court you would probably need a lawyer. The lawyer would cost more than what you are asking for and it’s likely you would win, but the court would probably not award you costs because the legal costs exceeded the cost of the claim.
You could try to represent yourself, but your chances of success are somewhat less and you may be burdened with the OCs legal costs.
Its not fair.
Try to negotiate a resolution with the OC outside of the court.