Just a note to say though that ear infections even when treated can cause damage...its not just untreated ones...my friends son has had major ear problems since early childhood with ear infections and has now gone completely deaf in one ear despite being under the care of one of the top specialists in the country for the past 15 years (who would always see him at short notice when he had a flare up)
So do complain but if its found that his actions/inactions have not caused the damage don't think you are being fobbed off...it could well have happened anyway.