DHL Express India — Consignment from USA through DHL express [protected]

Person staying at US, sent some clothes, vitamins, splenda . Furnished all deatils like value weight invoice.KYC details were asked by dhl, When landed at Bangalore waiting for custom clr. dhl asked us to furnish declaration letter to deputy commissioner saying gift items and no payment involved fro here and form 7 duly filled.
inspite of all this giving dhl clearing agent did not convince customs with the letters and form 7.Asked us to pay 100% duty .
The way they have opened items with out taking any care.All things were just stuffed back .why dhl didnot able to convince properly
not able to contact clearing agents because of call centre
such shabby treatment calls for boycott