I hate to be the one who has to disappoint you, but you'll probably never get it unbanned.
Over the years I got a lot of them banned. I never managed to get any of them back. They response was always "This domain was reported as spam by our community, we're sorry but we can't unblock it..." - something like that.
I tried all kind of excuses, like admitting I spammed and promising I won't do it again , saying competition spammed their platform with my links, acting like dumbass and saying I didn't know I'm violating their ToS. Answer would always be the same.
What do you think, what caused the ban? What exactly were you doing?