Removing Credits Doesn't Work

think a producer listed me incorrectly

Did the producer list it incorrectly in the on screen credits or when submitting it to IMDb? Do you have access to a screen capture of what appears in the credits? How to fix it depends on what's on screen, which is what IMDb documents.

Correcting it to the right name/person would be the way to fix it, not outright deletion, in most cases. If you were, indeed, credited on screen but did not do the work, it can be noted that way with an attribute for "credit only" to show it appeared but the work was not done. That way it won't be continually added back in any time anyone audits the page and sees your name in the credits.

TV shows like Vampire Diaries almost never provide on-screen credits for VFX Artists who worked on the show.  I can certainly try to find out whether that's the case here, but it's unlikely.