From July 1st., 2017 the "Reciprocity Fee" will no longer be required for Australian Citizens to enter Argentina.

(Disposición 3908-E/2017, Dirección Nacional de Migraciones)

http://servicios.infoleg.gob.ar/infolegInternet/anexos/275000-279999/276...

All those who have already paid the "Reciprocity Fee" for travels on or after after the 1st of July 2017, should send their claims to the following email account: reciprocidad@migraciones.gov.ar