Is there a way to politely dismiss a stubborn client

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Any business person believes that without a client, the business is as good as dead. In fact, philosophically, the client is always considered right. Taking another philosophical point of thought, a bad client can be like a rogue driver a who causes accidents and consequential harm to other good road users. Not a single business has had an experience with a stubborn client. Such type will always complain about anything and will always want to be given greatest attention. They will expect or even demand to be treated in a way they want, failure to which they can cause staff to face disciplinary action. As a result, one may end up losing other clients or competent workers. As for me I really yearn to dismiss them but courteously. I have however lacked the best way to do so. Is there a polite way to tell a client that you would not like to have them anymore?