Standard Chartered Bank — b2 over limit fee charged illegally

Address:

Bangalore, Karnataka, 560032

My credit card is charged b2over fee illegally. As of my information credit card in india should stop transactions if my credit limit is over. But standard chartered credit card are permitting even if i have low credit for that transaction and applying a high fee of rs 500 + gst. So if my credit balance is 10 and if i try to do a transaction of 20 rupees, they will permit that transaction and apply a fee of 500+gst. How idiotic, after this transaction i will not able to do any further transactions. This is what we call day looting. So in effect i'm paying a 60 times interest.