I don’t know where to start with this, what a mess. A few comments:
– when the special levy was approved at the General Meeting, did the owners also approve entering into the contract for the remedial works?
– does the notice of meeting for the variations include approval of those variations, and not just the raising of the special levy?
If not, the special levy will be approved but not the entering into the contract.
If I were you I would be putting in an urgent application for appointment of a managing agent, on the basis that the scheme is dysfunctional.