Valve employees will never communicate with you about your account using any chat system including Steam Chat and Discord. The only way you can speak with a Steam Support agent about your account is through the Steam Support Help Site. There's no situation in which you'd need to reach out to a Valve or Steam employee directly to resolve an issue.

If someone claims they reported you accidentally or falsely, you do not need to do anything to protect your account. These claims are fake and meant to scam you. If someone did report your account falsely, Steam disregards false reports.

Anyone claiming to be a Valve employee or Steam Support representative, asking to verify your items for an investigation or security reasons should be immediately reported for trade scams.