I have this same issue, when I go to the location where the map says he is, the marker spins around and when you look down he is 16.347 meters below. I think that is quite the hike.
The quest is not finished tho. The kid I saved is sitting next to the aembassy, and when I wanted to go to Emerald Stairs. The lady from the resistance reminded me of growth and rumblings in that cave and people hoping that they would make it out alive. So I guess me not reporting that will have consequences.