DTDC Courier & Cargo — My documents were not delivered not able to track

Address:	Kolkata, West Bengal, 560047
Website:	www.dtdc.in/tracking/shipment-tracking.asp

Package contains some valuable insurance claim papers and packed on 31st March. But once it reached kolkata not able to track its current location.Multiple times we have called customer service but not able to get any help from them.They are such worst service provider ever. I am waiting for the paper to claim insurance and time left very less, but yet no sign o[censored]pdating of current situation. Consignment number is k94866571. please help here.