you can send in a contact us
I do remember them saying that trades are done at your own risk. that is why you have to trust the person you are trading with.
and if enough people report
the same scammer, the GMs might take action against the scammer.
I know they dont give AP refunds, and they probably wont give you your items back if you gave them to some one, but you can send in a contact us
and ask them if they will.