Problem: user has left review of iPhone app which is simply incorrect

Question: is there a way to make contact with the reviewer and a) explain how what they've said is incorrect and help them with their issue or b) challenge the review?

##### Edit Sept 2022

1. This is probably no longer relevant given that it was asked 12+ years ago.
2. At the time this app (no longer on the App Store) allowed users to add configuration items and remove them. The UI centered around a table which looked like the iPhone's settings TableView view at the time. The UI I had written was not intuitive enough for users to realize how to remove the items.