Airtel — dnd complaint - no feedback on action

Had made a complaint of a spam call from a certain number to airtel. Had received through an sms the complaint registration number and a commitment that airtel would revert on status within a week. Nothing came. When contacted, the customer service person said it was not their policy to revert on the action despite what was stated in the sms.
Despite prompting - the person kept stating that the number against which the complaint had been made had been blocked but did not answer why advice to this effect had not been sent through sms to me as stated in the sms giving the registration number.