I mean, at some point, when you knowingly allow your site to list items from vendors you do not curate in any shape so that you without a doubt know that your vendors are selling legit, legal, un-spoiled, not past sell by date, or any other form of decent business practices, then of course you're going to make it harder and harder for people to complain. The first step is always just ignore complaints. The second step is to just remove the option to allow for complaints. Just like that, you're complaints go way way down, and some manager gets a bonus for improving something.
Also known (not so fondly) as "frupid"
Really wish that frugality wasn't used in so many perverted and hypocritical ways (internally, mainly)