Standard Chartered Bank — credit card overdraft

Address:

Chennai, Tamil Nadu, 600006

My brother got credit card of this bank and withdraw cash below 50000. And he started repayment later, that time bank issued unbearble inerest of the money. Due to late payment. How to get noc from this bank with reasonable payment. So many communications made with bank but they treated the consumer in a incorrect way. Hence the consumer get upset and he is noway to come out of the issue. Kindly guide us how to overcome this problem with actual payment