Mods cannot be contacted via help or email. You can wall, gift, or PM them. But they are not the engineers of the game so they wouldn't really be able to assist you beyond basic troubleshooting.Is there any other way to contact help support or mods/admins besides in-game help and email? Neither of those options worked for me, and I can't trade, so I'm trying to contact someone who can help me.
Admins are ranked people within a club and, again, can't be contacted via help or email. And would have no control over your trade issue anyway.
Developers can only be contacted via the in-game help ticket. Keep sending tickets and be as detailed as possible. They're the only ones that can assist you in this. You could possibly talk to a mod and have them reiterate your issue to the devs since they have other means of contacting them.