Union Bank Of India — misbehavior by branch staff

I have a joint account along with my son in shahdara delhi branch. Account number is [protected]. I have changed my son's name. Today i went to the branch for change of my son's name in the account. I was asked to meet mr. Gandhi. When i told him about my concern, he said what's the need to change the name. You people do such foolish things and we have to take load, secondly he said you can't change the surname. I replied that i can change surname of my minor son. He started misbehaving and took me to the deputy manager ashwani sharma. After listening he replied that name can't be changed like this. I replied that i have all the required documents and you do the formalities. To this he said that he has no time for such foolish issues. I replied that if this is the way you behave with your customers than i want my account to be closed. He replied that he has 60000 accounts in his branch and after that he started using abusive language.
I felt deeply insulted by their behavior and i want strict action to be taken against them, so that they don't repeat the same behavior with other customers and don't bring bad name to great institution like yours.