Requesting deletion of item from my IMDb Personal Details

I am requesting an item to be deleted from my IMDb page because I do not wish it to be included.  The information is correct but I don't want it to appear on my IMDb page.  My request has been declined because they say they are 'unable to verify the information provided'.  But I'm not providing information - I am simply stating that I do not wish that piece of information to be included.  Please note, I didn't supply the information and I don't know how it has appeared.  What can I do?