St Courier — Product damaged on delivery (irresponsible answer from courier staffs)

Sir, i booking courier from Erode (ST Courier, Near Collectorate) to Virudhunagar. in booking parcel i mention Handle with care in parcel. but after delivery to customer that material in parcel was broken. after customer informed that parcel broken in delivery. my Material rate Rs. 4250 Loss due to your service mistake. then i contact to ST Courier staff in (Erode). He is say's irresponsible answer. i am very disappointment ST Couirer services after this incident. please say the answer who is responsible to my parcel after given to safe delivery.