In very few cases, decisions made by the Employment Court are appealed by the union or the employer to the Court of Appeal.
Usually, the Court of Appeal will only hear cases that involve a question of law. The Court of Appeal will hear and consider submissions from both your union, acting on your behalf, and your employer, about the problem.
The Court will then make its ruling on the problem.
Under our industrial law this is the 'end of the line' when it comes to seeking legal remedies to problems.