In a case whereby a customer is with a decisive behavior pattern uses aggressive body gestures and finger pointing at you, the service provider, a strategy that I would use in response is to Talk and interrupt more than listen.
The best thing to do when dealing with a customer with a decisive behavior pattern that uses aggressive body gestures is to continue to talk after the customer should have poured out her mind because if you do not give the customer to be able to pour out her mind she might not listen to what you want to say.
It should be noted that once you start giving the customer the response to her allegation, you should focus on the message you were trying to pass accross to him instead of listen to her further due to her behavior which is very aggressive.
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