Indian Overseas Bank — closure of my account

Address:

Coimbatore, Tamil Nadu, 641045

I went to bank for to close my iob savings bank account with the request letter, but not getting a proper response. They not even ready to see my letter and simply said come by monday or tuesday, so i need to apply vacation for job,
(Red fields branch, ramanathapuram, coimbatore), even bank people may busy but the same time customer is also important,