Are you a native English speaker? If so, did you look carefully at the website's home page? Here's one of their paragraphs:
"As our principle is to take the exceptional care of every our client, we guarantee you an individual approach with a flexible work routine. We welcome everyone to become our returning client and experience all the bonuses of personal approach with us." Or "Feel free to trust us the most difficult task on any topic - our strong command of professional writers will do this for you the best of the best."Does that sound like someone you'd trust with a paper? They also promise you unlimited rewrites without any qualification. If I were writing professionally, I certainly wouldn't offer that without condition.
Although I will say their YouTube self-promotion was pretty funny.
youtube.com/watch?feature=player_embedded&v=P8HMcG3g2Q0
When did you find out it was 95% plagiarized? You say it was paraphrased, so I'm assuming there were no citations?
I'm sorry this happened to you, but it sounds like the worst consequence was a failed grade, which is better than expulsion.