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first of all you let him vent me listen to his frustration, during my quite time listening I gather information regarding the issue..
second, I summarize what he/she said in my Own words, and a sure help (to show Empathy)
find alternatives to to solve the issue....
first put mind the customer is always right,listen to the complaint and attend to the customer in a calm situation and if necessary apologise.
Be calm the customer down by listening to his complain and resolve his issue as soon as possible.