The explanation: there may be several reasons why a customer is dissatisfied that the damage caused by not understanding. Therefore, employees will need to find out the cause and find a way to edit.
Not understanding: There might be several reasons for customer dissatisfaction caused by a misunderstanding. Thus, employees will quickly find the cause and find a solution.
To understand: there may be many causes of potential customer dissatisfaction caused by the don't understand. So the staff will find the causes and find solutions.