ICICI Bank — Credit Card has been charged a penalty for paying the balance by cash

It seems one more customer non-satisfaction policy has been introduced. My credit card payment was made by cash at the bank, and for this my credit card was charged a penalty fee. How does a banking organization expect me to deal with them if not with cash. Promoting non-cash transactions is fine, but levying a charge for cash transactions is the zenith of making money out of the customers. Even the personnel at the bank did not inform of the charges when the payment was made with cash. Not sure why ICICI Bank is advancing in the wrong direction !