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This wholesale club chain has become king of the hill in part by wooing customers with handy new technology.

Costco — long the undisputed king of warehouse clubs — has been dethroned, at least in one aspect of the consumer experience. The iconic retailer has slipped from the top spot for customer service among all warehouse clubs, according to the latest annual American Customer Satisfaction Index (ACSI) Retail and Consumer Shipping Study. The ACSI survey elicited opinions on various types of…