First Flight Couriers — Long delay in delivery

Address:

New Delhi, Delhi, 11096

I booked my consignment through m/s first flight courier ltd., new delhi on 28.03.2016 but consignment not delivered upto 04.04.2016.
When i was booked consignment, they asked delivered within 72 hrs.
My docket no. Is D991B6072348 booked from New Ashok Nagar on 28.3.16.
I also tried to call customer service, but no one picked up the phone.
Finally one man recieved the phone and he told me that delivery Van is seized by Sales tax department in Firozabad. It's ridiculous.