State Bank Of India [SBI] — debiting of available balance

Address: 534313

I face every month an debit of nearly 100-200/- from my sbi account. I want to know what is going with my account why the bank is debiting my money every now and then. Always i find the msg of your account has an debit of xxx. Every time i see my debit card at any place i get a msg of your account has been debited of xxx if the debit is of the bill i pay it's okay but why do you charge extra on the customers like this every year you cut the minimal charges again. This is not at all fair from the bank like this.