Hey Stephen,
I would agree with those commenting above. Talk to the Agent, preferably in writing. Escalate to the Broker, again in writing. If you are terminating the listing all together, there is a "Termination of listing" which should be filled out and signed by both you and the agent. If you are temporarily removing the home from the MLS, you would want to fill out an amendment to the listing, again in which both parties sign. The listing agreement itself, is a binding contract between you and your listing agents brokerage. In the event that either you or the agent want to alter or terminate the contract, it does require mutual agreement from both parties.
Lastly, Is your home active on HAR or other sites? HAR is the local MLS, a home that is listed or unlisted here automatically goes out to many other sites such as Zillow and Realtor etc. Some of these sites are slower to update than others. HAR updates within 15 minutes, other sites may take a week or two to generate updated information.
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