Hello Mexy!
Sorry to hear about this 
I can guarantee you that we keep a close eye on these types of users, so in case they do it again, thei account gets suspended.
I’m happy to know that you provided full support and even contacted Steam. Those are the correct actions in cases like these.
Unfortunately, there are scammer every now and then, but everyday we try to remove as much as possible to maintain a clean and fair marketplace for all the users.
God speed!
