Delhi International Mail Centre — Item stuck in customs import clearance

I have sent 2 packages to potential customers in Kanpur.
These were both free trade samples and the actual value of goods is approximately USD $1.00. The relevant paperwork was included with the package.
The tracking numbers for the packages are:-
LP[protected]TH & LP[protected]TH
These have been stuck in customs clearance so far for 11 days, with no legitimate reason that I can see.
This is seriously affecting my business and could result in the loss of any future business from the potential customers the samples were sent to.