St Courier — Parcel not delivered to Bihar

Address:	199, Hariyan Street C.Pallavaram, Chennai
Website:	stcourier.com/about-us

I have booked a parcel for the month of Aug and still haven't received it has called the courier guys multiple times, send multiple emails but no solution. MY colleague has reached them physically and asked for the return. However, we are just running from pillar to post. not sure what to do. it looks like they are not caring and not providing any correct answer

Below is my complaint number:
We acknowledge the receipt of your complaint about AWB No. [protected] and the complaint ID is TNMAA44930