In the listing agreement you signed you will find a section labeled 'Cancellation' or "termination."
When you have complied with all the conditions stated, and the broker still refuses you will need to evaluate the best of these two options:
1. Let the six months expire
2. Go to an attorney to press the matter on your behalf.
If you elect the action of 'smallness' you may hear from the brokers attorney. There is no issue with stating the FACTS and attributing them to the proper parties. Read the 'cancellation' or 'termination' sections and determine on whose side the facts align.
No showings. Broker does not show the house. If the home is promoted on the Multiple Listing Service and no showing are occurring, there is very likely more to this story. Provide the link to the MLS listing and other local professionals may be able to respond with more direction.
Best of success,