Yay!! Thank you very much to all of you who have given me advice and sent me links, in person took down the entry by that person who had stolen my drawing

Thank you so much, you are the best, guys!!

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Hi there guys!
As the title says... some guy took an old fanart of mine and submitted it to a t-shirt contest here [link] claiming it as theirs.

Does anybody know how this site work, and if it's possible to make them putting this thing down?
I'm really upset. Luckily, it's not one of my recent fanart or I would have killed them or something haha xD

Thanks in advance to everyone who can give a little help!