You could just appeal your warning by using the template below:
Name - What is your in-game name?
STEAM-ID - What is your STEAM-ID?
Staff Members Name - Who Warned You?
Warning Reason - What was the reason of the warning(s)?
Server - Which Server did this occur on?
Story/Situation (What Happened?) -
Extra Information - Anything you would find relevant to your warning(s)?
Don't make a new post though,press the pink edit button to edit your thread.
If you feel he did something wrong you can also report him using this template below:
Staff Member(s) Name:
Staff Member(s) SteamID:
What did the Staff Member(s) do?:
What server(s) was this on?:
Evidence: