Inspiration vs Stealing

File: rsz_psx_20170728_000630.jpg (81KB, 1000x768px) Image search: [Google]

81KB, 1000x768px

Okay so I'm part of this 99designs Logo contest. I submitted three designs to give the client some variety to pick from (super sleek, modern, silhouettes with flat colors). It seemed like the client liked them because they gave me a decent rating compared to a lot of other entries.

After finalists were chosen (I was selected among them), I went back to check if there was any feedback. What I find is that someone took their totally original logo design (cell shaded, thick outline, highlight..really cool looking) and then literally submitted two more entries that abondon his original intent in favor for what I did. Now, in writing this may seem like just using my design for inspiration and totally not plagiarism. However, I tell you this user took my look (flat silhouettes, sleek), took my layout, took my exact colors, and placed the logo EXACTLY where I've placed it.

The only thing is that his symbol is different. Everything else is the same. I'm wondering if I should take action and report that user's ass.
Crude pic related isn't exactly the design, rather a visual representation of what happened.