After reading so many -ve comments about DTDC courier service, I was scared to send my document by it. But to my surprise I found it the best, they just delivered in time.
You can also check with the tracking number. I had booked the document on Friday in Bhubaneswar at 11 am and they delivered it to Delhi on Saturday (next day) at 4.35 pm.
You can also check with the tracking number which is given below:
Tracking Number: V14559568.