Vinicia Melissaeia is an imperial noble who sells the shack on the Waterfront and is responsible for taking complaints from citizens living in the Imperial City. She is found in the Office of Imperial Commerce and when spoken to will say:
"Vinicia Melissaeia, Office of Imperial Commerce. You got complaints? Of course you got complaints. Who doesn't?"
"You have complaints against merchants here? You file complaints with me. I fill out lots of forms, which go to a lot of people who ignore them. So what else did you expect? Justice? Go to the Chapel. Talk to Zenithar. He'll take care of everything."