St Courier — Delaying the process always

Address:

Kanchipuram, Tamil Nadu

We had couriered the parcel 4 days before still its not delivered. I have called to the respected office (ST courier, Guduvancherry, Kanchipuram district) and there is no proper response from the staff and they are talking very rudely. I think they are working for serving the customer. What is this? Is this the respect there are giving to the customer?