Assuming that you have the correct facts and documentation on a public tree, read this:http://boards.ancestry.com/topics.ancestry.ancimprovements/2...
It's unlikely that your update will correct all the errors. Some people may have a tree and not even use the site anymore, and others will ignore you.
NOT SURE if this is true from what I read from experienced members who try to help:
"In the majority of cases if you draw attention to an error they are happy to learn from this and correct their records."