Possibly scammed in a trade? What can I do?

[Tyrrion]

I don't want to put an amount on it, but it was smaller than I'd give to someone who is getting started with the game and seems nice. It was less than I would immediately notice in the cash I had in my pocket even if it was a successful trade.

I really don't care about the plat, what matters to me is confirming if I got ripped off, and that the person in question is punished if so.

Edit: I was worried about posting this thread at all because I don't want my business to have a reputation for calling people out as cheats, but a friend recommended I get some advice from the community before I move forward.