St Courier — parcel duty charge from the receiver

Address:	Chennai, Tamil Nadu, 600047
Website:	www.stcourier.com

I had sent a parcel meant for personal to ireland via international st courier service chennai.
On[protected] and paid all the due amount and checked-in all the things in the parcel.
Now, from the receiver, they ask charge to pay.
I was not informed of such duty amount by this st courier office.
Why do the customer had not been informed of it.?