Steam Support does not reach out to people by Steam chat or Discord. Anyone approaching you that says they're from Steam Support (or SteamRep) and asks for your account information or items is a scammer.
Login via Steam
http://steamcommunity.com/groups/Ts-Traders

Members: 3 (Scammers: 3)

001:
Allen™
 
76561198011993442
 2009-07 BANNED BY SR
002:
Mr.Shader
 
76561197994769282
 2007-12 BANNED BY MCT BANNED BY SR Banned Friends:
6 out of 26
003:
Dmbn
 
76561197997410746
 2008-03 BANNED BY SOP BANNED BY SR BANNED BY UTC Banned Friends:
2 out of 47

Valve and Steam are registered trademarks of Valve Corporation.
SteamRep is hosted by the non-profit Online Fraud Prevention Foundation and is not affiliated with Valve in any way.