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If they were not differentiated, then it would be "Defensor del Usuario y DE la Junta Arbitral ...". This short line seems to call for the creation of two separate entities, the ombudsman PLUS an arbitration committee. I agree with Terry, more context.
Explanation: El título de Defensor, cuando es del pueblo se denomina también Ombudsman, pero no es apropiado a este caso.
También se utiliza el término People's Advocate.
Por analogía se puede crear el título de : Advocate of the consumers/users
new department to act “as an advocate of the consumers’ interest at all levels. and stages of government.