Learner's Area Griefer

There is this one guy who is griefing the learner's plot. I have proof in some screenshots I took. They include what he did, him lying to me when I have proof, and proof using the hawkeye tool. I cleaned up the mess with WE, but there is still blocks that he deleted missing. You can find the pictures here: http://rollercoasterman555.imgur.com/all/