DTDC — Wrong price was charged

Address:

Kolkata, West Bengal

Hi, I had sent one courier via DTDC (Consignment number -K[protected] on 23rd March, 2015 from Kolkata (Jadavpur) location to Hyderabad location for which I was charged Rs. 180. The parcel was containing some documents weighing less than 400 gms. Later when I checked the price for the same weight between same locations with the product facility 'Lite' I noticed that the actual price was Rs. 120. I was wondered how the franchise charged me so much extra amount and he issued me one manual receipt only. Kindly let me know what is the actual courier charge for the same. regards, Sumanto