Valve Employees will never ask you for personal or account information, on Steam or anywhere else. You can safely ignore anyone who claims to have mistakenly reported you - that will not get you banned. If you need help with your Steam account, go to https://help.steampowered.com/.
Brian Jacobson [VALVE]
Brian Jacobson   Seattle, Washington, United States
 
 
This is Brian Jacobson from Valve. There have been reports of scammers trying to impersonate me on Discord. It's not me, and no one from Valve will ever contact you over Discord; and I will never contact you personally ever over any service. We don't have any ability to take down scammer Discord accounts; please report any such scammers to Discord.

https://support.discord.com/hc/en-us/articles/360000291932-How-to-Properly-Report-Issues-to-Trust-Safety