Sellers have the option regarding allowing their homes information appearing on 'non-professional' websites. By consenting to have your home appear on sites like Trulia and Zillow you effectively lose all control of your homes information and how it will be used and how long the homes information will be leveraged.
If your agent did not disclose this to you, they deserve a bump on the head.
Seller should chose to NOT SYNDICATE to non-professional websites. Real, qualified buyers are using their access to the Multiple Listing Service to make their real estate decisions. Their agent instructs them to verify the home appears in the MLS before calling the agent. The value you think exists by losing control of your home information is pure deception.
You will not be able to put smoke back in the bottle, but you can try.
Chat with your agent and take the action that actually bring value to your effort.