Indian Overseas Bank — I'm complaining about cashier in bank

Address:

Tirupur, Tamil Nadu, 641602

I'm a person having account in indian overseas bank (Branch-pandiyan nagar, tirupur).in these branch, the cashier didn't provide him service properly. He treating the people very rudely. And also he doing his work very slowly. By this peoples getting irritated. India has embarked on a major revolution towards a transparent economy through digital payments. But now only the uneducated peoples are took their first step to banks. Likewise these type of servants hurting their ignorant. It should be stop. Please kindly take some action.

Yours faithfully,
Citizen of india.