Hi, As mentioned when I asked you to make a forum report, we require evidence to be in screenshots, not just copy paste. A few things both for this report and for your personal/account safety:
Take screenshots of all messages. Your most recent messages if unavailable in the client should be accessible here: https://help.steampowered.com/en/accountdata (Google "Steam account data" if you would like to avoid links. It's a good idea) to submit in this report
Take steps to secure your account. 99% chance this guy just has some doctored images and is trying to scam you into giving him your stuff. Virus scan your PC, change your password to your steam account and email, and make sure there's nothing fishy going on with your phone either (given you mentioned he had your number). There is a good chance that this information was gained through another websites data breaches, and is now trying to turn it into money by scamming people, unless he has actually hacked you.
Report the user on steam if you have not already.
You may wish to report this user on steamrep as well, though make sure you very closely follow their evidence guidelines.
It is important to note this user has never joined the EGC servers from this account. Banning them from EGC will probably not stop them contacting others or you from being contacted by other scammers. Please exercise extreme caution when you're contacted by randoms with suspicious offers and if someones contacting you telling you they're going to hack you, immediately block them and consider the steps above to protect yourself.