请大家帮忙修改其中的语法错误.

请大家帮忙修改其中的语法错误.
What are the benefits do the company get from the complaint?
Complaints can point out the shortcomings of the company and then they can improve their product or service.Complaints can give you the chance to go on to have the service to them,and make them to become the long-term customers.Complaints are also can improve the ability of staff about handling the complaints.
When you are handling the complaints,you have to know the requirements of the customers.
First of all,they need be concerned.They don’t want to be ignored,and they want to get attention and treats.They want to contact with the people who is really concerned about their requirement and the people who can solve the problems for them.
Second,they need to be listening.Customers need to have the fair treatment,not the complaint,deny or excuses.Listening can find the solutions of the problem,and it can train us away from the blame,denial,excuses.