St Courier — consignment missing

Address:

F1 P2 lakshmi Nagar 3rd Street Sembakam Chennai, Chennai, Tamil Nadu, 600073

Ref to the st courier (Pod copy # [protected]) on 4th nov 2019. Instead of 2boxes delivered only one box having weight of 8.7kg. (Actual weight is 17.8kgs).
Then i was called st courier head office in chennai and asked the status of my goods. They also confirmed only one box was delivered.
Today also i called customer care (Ms. Sharmi& mobile no; [protected]) and asked the status but she told information passed to operation team and get back to you.
So i request you to kindly take necessary action to deliver the remaining one box at the earliest and request update the status.
Looking for your quick reply.