rockstar – if your current Strata Manager was appointed by a Tribunal, then under the usual terms of that appointment they’re able to autonomously exercise all functions of the Executive Committee and the Owners Corporation, including the setting of Levy Contributions.
So to borrow a KWP’ism, you’re stuffed!
So on the subject of both your Levies and how your Plan is managed in that context, perhaps some clarification of how the Strata Manager was appointed would result in some (even) more relevant replies.