You're in completely the wrong forum, which is maybe why you're not seeing any replies.
>What can a person do if he had not handed in his licensed firearm?
Why do you want to hand in your firearm? Do you rather mean "if he has not renewed"? See the GOSA front page, http:/www.gunownerssa.org. For now, all licences are valid.
What have YOU done for YOUR rights today?