Can a collection Agency charge you attorney fees if you were never notified of the debt?

Technically, maybe. Here's the thing, if a collection agency shows by their records that they have attempted to contact you and you either did not respond or they were unable to make contact, then yes, they can recover any costs associated with collection of the debt. That being said, you would be hard pressed to prove they did not contact you or attempt it. I essence you would be attempting to prove a negative, and that cannot be done (except in the case of theoretical mathematics).