Can a joint tenant refuse a buyout and force a sale?

Question Details: My husband and I own a duplex with another couple in Los Angeles, CA. They want to sell and we do not. They found an agent that listed the home without our signatures or any consent. We did not sign a listing agreement. Is this legal? Yesterday, the agent contacted us to tell us there was an offer but he refused to say how much the offer was for. We have made it clear we do not want to sell. About 6 weeks ago, we paid an appraiser and offered to buy them out. They refused and stated that they would prefer to sell to a stranger. We have tried to negotiate. Our home is still on the market even though we have written and called the broker and the agent and asked them to remove the listing and explained that we are able and willing to buy them out. Can they refuse a buyout and force us to sell without going to court?

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