Not starting a war, this author said the same thing, that the book was made by a fan. Someone is lying here. I'm not pinning the blame on one person, one of you has either stolen this cover or the fan who made it has told both of you that they 'drew' it as fanart for your book. In that case it's the fan's fault for false art.
I ain't trying to start no war, the whole reason I clicked on your profile was because I thought the character in the pfp was hot, then I saw the cover. How can the same fan art be for two different books?
If you truly didn't steal the art, who drew it? And are they on Wattpad?