Wrong date for my short - need to reset as never publicly screened and has been developed further and now want to submit to festivals

Hi, I had this problem with a previous short and it was resolved with help from IMDb staff. Tried to fix it by editing the film's page but no luck. Basically, my film Spirit Realm has the date 2015 attached to it and I have reworked it an had a new score composed and made changes to cast and crew but some things I cant change because the system has it as an already released film so some things are fixed as though they were set by the credits etc. at time of release. Please help me to reset this so I can go ahead with festivals. Thanks you for addressing this,

Kind regards,

A.L. Nott