Sorry for bringing you so much trouble and making you so exasperated.
I don't know which agent  you are talking about, but most of them are very friendly and patient. In fact, many customers have sent testimonial to praise them.  You have mentioned in the text one of them even closed the chat when you are talking. It is extremely impolite, even rather rude and is strictly forbidden in this company. Once spotted, a severe punishment will be given. So no one dare to do this on purpose.  Have you ever thought it may  be a misunderstanding? Is it possible that she or he just disconnected by accident? I guess, you must have disconnected once when talking with your friends online.
But your feedbacks did  sound  the alarm! Maybe we just wanted to tell the customers effective ways to solve the problems, but the improper  tones or phrases  we used  misled  our customers believing the agents  were impatient with  your problems  or not enough attention has been given to what  you really  wanted.  With no doubt, the systematic learning of  speaking courtesy and techniques  need to be  reinforced in our customer service department.  And we will look into this matter and keep an eye  on our agents'  daily performance.
Thank you for posting your honest views here and asking the forum for help.
We sincerely apologize for what you have gone through.
Still looking forward to doing business with you in the future.