Hi, There are two sellers are using my design as a profile pic. I made this design on other contest website. I have all source file for this design. I can prove that this is my design. Fiverr customer support is not doing anything. I think fiverr is encouraging fake designers on fiverr. That is not good for fiverr.
All you can do is hope Customer Support helps. Also get in touch with the sellers who are using your work and tell them that they must legally stop using your images.
I agree contact them directly and ask them to take if off. Best of luck!
What were the terms of the other contest site? What did the fine print of that site say? that may have something to do with other people using it. What kind of contest was it for?