had been contesting
-había estado disputando
Past perfect progressiveconjugation ofcontest.There are other translations for this conjugation.

contest

Calver said he didn't fill out the financial assistance paperwork earlier because he didn't feel he owed the $108,951—and had been contesting the validity of the charges all along.
Calver dijo que no completó los trámites de asistencia financiera antes porque no sentía que debía pagar los $108,951, y que estuvo impugnando la validez de los cargos todo el tiempo.
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