Fraud

I did some homework that took an all nighter and sent it to my assistant to print it just for her to print a totally different piece that is not mine and not as informative and descriptive. It's annoyed me so much I cried from anger. I can't understand why something like this is done, it's my work and it's work my grade so why did you print a piece of work that's not mine and not as informative as mine? Why was this so necessary it's made me so irritated