A client may cancel a contract or service plan entered into with a homemaker-companion agency, pursuant to this chapter, at any time if such contract or service plan does not state a specific period of duration. A client shall only be obligated to pay for actual services rendered pursuant to such contract or service plan. A client shall not be billed by or on behalf of a homemaker-companion agency for excess fees or costs when such agency provides the services of a higher-skilled individual than needed by the client.