Definitely the correct and most sensible course of action is to call up and admit that you are lost. If I am in charge, and the infringement has not been a serious one, I will have a chat with the pilot on the 'phone and leave it at that. if the plane comes into the zone and then makes a run for it, I will track the bastard down to the ends of the earth if I have to and report on him. Honesty is the best course of action.