Board Thread:Support Requests - Getting Started/@comment-32522429-20181222051835/@comment-1038387-20181222101026

You get unbanned if that admin decides to unban you. You can plead your case on their wall on Community Central. Be as non-confrontational as you can be, as you've only got one shot at this. But as you've only been blocked for three days, I recommend waiting it out.

See these for additional reading:
 * User blog:Sannse/How to Get Unblocked
 * User blog:Sannse/How You Can Work Through an Admin Dispute
 * User blog:Sannse/Why Staff Don't Remove Bad Admins