State Bank Of India [SBI] — arrogance behaviour of employee

Address:

531126

Dear sir,
My grandmother is a customer of sbi bank, tuni andhra pradesh and my n am e is mrudula. I went to bank with my grandmother on 19th of dec 2018 for submitting an application to change name and phone number. The employee who was sitting at counter no. 9 dy operations he spoke rudely with us."saying its a bc time account when i was not born also, its a 30 years back account and you are giving request now and at that time i was not born". These are the words of that employee, and how rude he was. He need to give proper answer to submit documents. I want to raise a complaint against him to take a severe action. Bank employees should be there to help customers not to loose customers. If he is government employee he can talk anything or what? He should have patience.