St Courier — Courier not yet received (Courier sent from Coimbatore on 11thJan2021)

Hi Sir/madam,

I am from palani. My relative sent courier from coimbatore on 11thJan2021.

But i have not yet received courier.almost 3 days over.

I called ST courier palani. They have not respond properly and answered very careless.

Please let us know when we get courier?

Today date is 14thJan2021.

Yesterday went ST courier office at 7pm. Office was closed.

I called them, they told office will open on 16thJan2021.

Then why we have to send courier? What is the purpose of courier?
We dont know

Worst experience ever.