Mocking and laughing at customer

As discussed this morning, one of your staff for the tint was laughing at me when I tried to explain what is it I wanted

I didn't even finish what I was saying and he started to laugh at me.

How does PG glass management allow such behaviour to mock and laugh at paying customers. I will not take this lying down and will not accept such behaviour from PG centurion staff.. I even brought it to the attention of the branch manager of of glass centurion Mr Andre and he advised that he will deal with however I'm not convinced as the manager advised that he has done this before and he did speak to him, and clearly no formal action is been taken. I am writing this review so that other customers would not experience the same type of insults......