Standard Chartered Bank — credit card billing complaint

I have a standard chartered bank credit card numbered [protected] for which the payment date was 13/03/2018. The minimum payable amount was 4300/-. I forgot to make the payment. On 17/03/2017 they generated the new statement with exorbitant charges. The outstanding becomes now 11, 749.31/-.. They called me up to make the payment. I would have no problem with that but they did not give any warning call or send any message to remind the customer that a payment has been missed. It is a practice that is carried out by all the credit card companies. When i raised the point i was told that it was not in the company's policy to warn the customers. This was ridiculous as this means the company deliberately wants the customer to get into trouble. Also there is the issue of overbilling such as calculation of gst 3 times in the same billing cycle. They failed to provide any satisfactory answer to these questions.
Note: there is no option of attaching the statement. I am sending a screenshot.