St Courier — Missing of Cheque

Address:

Akshaya College of Engineering and Technology, Bagathivalayam Road, Kinathukadavu , Coimbatore-642109. Tamilnadu

We sent the cheque to Coimbatore from our College on February 16th 2021 through ST courier service at Kinathukadavu branch . AWB no- [protected].
Till now parcel is not delivered, Showing as out for delivery from February 20th 2021to till date. No correct response from booking office and saying we are not responsible for missing .
From booking office they telling as once booked and we sent to next destination is work over, we are not responsible for not delivered.
Is the way of communicating to customer who doing regular courier from organization . What happened to the parcel we sent ?Ur staffs stolen?
Kindly take the action and solve this problem. How to believe to send from your service ?
Very Worst Service.