Bank Of Baroda — deduction of 189 rupees from my account.

They deducted 189 rupees from my account.
I called customer service they are saying it’s because of not maintaining minimum balance in my accout.
As my account is zero balance account and i am using it from 2013. Many times i used to have zero balance in that accout but they didn’t deduct it before.
Now suddenly they deduct my accout.
What should i do ?