DTDC Courier & Cargo — Parcel not delivered beside being booked as urgent

Address:

New Delhi, Delhi, 110034

Sir i have booked a parcel of 7kg from delhi anand parbat for ludhiana on 9-3-17 vide docket no. V35184189.
While booking the person namely k k jha assured me that in urgent booking the parcel will get delivered next day between 10am to 4pm and asked me to pay rs1240/- instead of regular parcel of rs 450/ approx.
So due to urgency i booked the same paying 1240/-
In parcel there are some samples for the exhibition to be conducted in germany. The recipient has to parcel all the products to germany till 14th.
I provided the original bill and its copy to the dtdc while booking the parcel and the person himself pasted the bill envelope with the parcel and wrote the address of the recipient on it.
Now on 11th iam getting a call from dtdc that the parcel has been returned back and they need a copy of bill again and now will deliver the same on tuesday ie 14th so why they have charged me such a huge amount when they can't handle the parcel and documents properly and secondly what is the use of sending the parcel in advance when the final day it might get deliver. And on one knows whether it will get deliver on the day or not..
Pls do the needful to save us from the unmeaning, unethical and unprofessional treatment from such a huge and reputed courier company