challenge to union dues


Senior Member
English since birth, Spanish shortly thereafter
Hello foreros!

I'm translating a description of the procedure to Challege the amount of union dues being collected from employee's paychecks, and am wondering what is the best translation for "challenge" in this context. An example of the context is:

Individual nonmember fair share fee payers who wish to challenge XYZ's calculation of chargeable and nonchargeable expenses must...

Los individuos no miembros que pagan la cuota sindical justa que deseen contestar/cuestionar/desafiar/impugnar la forma de XYZ de calcular los gastos facturables y no facturables debe...

Thanks a ton in advance!
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