Send them a message on their wall warning them about edit-warring. (they also edited the template to remove info)

If they continue after that, you should block them.

Alright, thank you

I didnt want to over react.

You're welcome :)

Is this good?

"Hi there!

Please do not edit war. If you want the page deleted or if you'd like to add information, you can, but edit warring is not the way to go. If you decide to continue, you run the risk of being blocked."

> "When does blocking someone who keeps undoing an administrator's edits become okay?"

When there is such a rule in that wiki's blocking policy.

Usually there should be a warning first.

Did you talk to the user?