One of the most important customer service principles to apply is:

Question

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Thanking the customer for bringing the problem to you and expressing a willingness to help is a key principle of good customer service. This approach helps to establish a positive rapport with the customer and shows that you are dedicated to resolving the issue. A is not always true, as sometimes the customer may be mistaken or unreasonable. C and D are important, but they should come after expressing a willingness to help the customer.

One of the Most Important Customer Service Principles to Apply