How do I change an incorrect “ uncredited “ title to credited on IMDb ?

I did sound on the film Gran Turismo as the sound mixer for the Japan  section of the  film.  I am listed in the film’s credits as such and also on the film’s IMDb page as sound mixer. Yet IMDb has listed me as “ uncredited”.  Have sent 3 edits to IMDb but they keep changing my title not such as mixer to sound mixer etc. 

how can I change this “ uncredited “ title to “ Japan section sound mixer “. Thank you.