Thank you for your report, however judging by your friends list history here - http://steamrep.com/profiles/76561198248648360?t=1549755108 - you were contacted by this user - http://steamrep.com/profiles/76561198188019877 - who is impersonating the user you reported. It is extremely important to make sure you know who you are trading with before you complete any risky trades. I highly recommend using - https://rep.tf/ - to check who you are trading with. Copy the user's Steam ID directly from their profile URL and paste it where prompted. Do not use any links that they give you to do this check as scammers will often give you links that link to the user they are impersonating.
Please give a detailed description of what happened and provide screenshot evidence to back up your claims (screenshots of chat, trade history, paypal, etc.). All screenshots should be completely unedited. We are unable to investigate proofless reports.
A guide on reporting can be found here - https://forums.backpack.tf/topic/53663-guide-for-reporting-on-the-main-site/