Invalid ? (?)

I was making a trade with a guy who was going to give me LoL RP for 10 ref (pretty much equivalent price) and as a sign that we could trust each other I gave him 5 ref to start, then he gave me some phony code that did nothing and then he unfriended me and refuses to respond to anything. Scammer indeed. It was stupid on my part, but regardless, not to be trusted.
http://steamcommunity.com/profiles/76561198040894444/

We can't mark for that, sorry.