Yes Bank — Negative balance on my savings account

Address:	Chennai, Tamil Nadu, 600020
Website:	yesbank.com

Dear sir,

I have yes bank account with minimum balance of 10000rs.
However i have not maintained the minimum balance for last three months.
When i was opening the account, it is mentioned that 750rs will be fined if the aqb is not maintained.
However now they have charged me about 2300rs. When i have checked with yes bank they explained that the rules changed from quarter to monthly basis.

I want to action against them. As the rbi has ruled that there should not be negative balance on any savings account.