Customers are treated badly. Not all customers. Not always. But many are and often. Some customers are bad. They treat firms badly. Firms have to react. Employees and customers endure the consequences. Such bad behaviours, by firms and customers, have consequences for perceptions of trust and fairness, for endorsements and referrals, for repeat purchasing and loyalty, and ultimately for a firm’s profitability and RoI. The management of customer relationships is core to the success and even survival of the firm. As The Dark Side of CRM explores, this is an area fraught with difficulties, duplicitous practice and undesirable behaviours. These need acknowledging, mitigating and controlling