A:
You're right.
The revote was out of order.
(See RONR p. 332.)
It is possible to reconsider a vote taken earlier at the same meeting (by the motion to Reconsider), but this was obviously not done in this case.
But now, you may have a more difficult problem.
Even though the revote was out of order, it's likely the referee association has been notified of the decision.
To reverse that now might put your league in a precarious legal position regarding breach of contract.
And even if it doesn't reverse the decision, it's also conceivable the league is in jeopardy of a suit from its own members for illegally contracting with the referees.
Check with an attorney before taking any further action.