Well - not sure why your agent can't address this, but, please know that agents are limited to what they can and can't edit in regard to their listings on Trulia once the isting appears on Trulia.
Listings are generated from the MLS!
For example, price cannot be altered by an agent - if I reduce a listing price, I have to wait until the change shows up here once it filters through the MLS (maybe it takes a day or 2) - I cannot manually change it. at the same time I may show it as reduced on the MLS - other pertinent facts also have to come via changes made by the agent on the MLS listing.
Sit down with your agent, and go over the MLS. See if the information there is correct.
I can't understand why the days on market are off - if that's a mistake Trulia made - your agent can reach out to customer service here and ask for help.
Honestly, I understand your frustration, but I really doubt the information on Trulia is causing a drop in your showings.
Based on my experience, the majority of showings are still generated via the MLS.and Realtor.com........and are often agent-driven.
Best wishes.... I am sure you will be able to get the information corrected............try: email@example.com