use rep.tf more often when doing trades as this can be found:
already banned here and other sites for this reason.nothing else can be done
Tied to Scam me out out 10 keys with an Uncraftable Lucky No. 42. literally heard him do it to another guy in my server before he hit me up with the same scam for my hat this time
Hello, what sort of interaction did you have with the user? Was it through trade offers, in game, steam chat, others etc.?
Closing due to lack of follow up. You can reopen this yourself if you would like to add the required evidence.
A guide on reporting can be found here - https://forums.backpack.tf/topic/53663-guide-for-reporting-on-the-main-site/