OK, the contract you signed when you listed your home says that you listed with the broker, not the agent. When an agent leaves a company, the listing stays with the broker. You need to read your contract. You have the right to complain to the Board of Realtors about any Broker or Agent that is a member of their Board. They can provide instructions on how to complain to the Missouri Real Estate Commission about any Broker or Agent who is licensed with the State of Missouri.