My understanding of this is, Audiology does not exist within The Spanish Health System, but is all privately run, and subsequently is relatively expensive, I know that 2/3 years ago a friend of mine,s wife, flew back to The UK to see a specialist there, I seem to recall a figure circa $2000 being mentioned.
However, there are two places I know of both in Rosario.
CEM up near The Hipodino and another two streets behind Las Rotundas cannot remember the name of the place, but I could dig it out if required.