A seller is able to include only first three images to demonstrate an example of their works. All the images that follow after - can be added by the customers upon the completion of the order, when they leave a review. Basically you are asked to leave a review (by Fiverr system) and there’s an option to add your product to the seller’s page.
If such is a case, contacting SC is a grand way.
However, if the seller added your work to any of the first three images, it’s where the situation gets tricky. You need to make sure that you do own copyright/ownership of the said product. It’s usually written somewhere in the seller’s description about IP and owning it.