It is one of the most maddening ordeals of modern life. You are having a problem with a product or service, and so (fool that you are) you call a customer-help number, only to be greeted by a cheerfully inept or robotically indifferent voice at the end of the line -- sometimes human, other times a simulacrum, and nearly always emanating from a source far from home. In "Your Call Is (Not That) Important to Us," Emily Yellin strives to "seek out the humanity and reason behind the customer service experiences that many people find to be inhuman and nonsensical."