Standard Chartered Bank — money deducted without consent from savings account for credit card payment

I was to pay standard chartered credit card bill and they kept calling me back to back for payment. Although i was paying their minimum amount but still getting interest added in outstanding, so i did not pay their last minimum due and was late for a month and they deducted the money from my savings account and left me with no money in account. This is very frustrating as things have gone very bad for me when i needed the money the most.