India Post — Retention of item

Address: Mumbai City, Maharashtra, 781022

Website: India post

Hi,

I hereby have attached a screen-shot of the tracking status of the parcel.
It hasn't been delivered yet.
The tracking status shows that the item was returned from Kolkata foreign Parcel to INBOMC India and the retention reason is given as other. The parcel contains a toy set. If any discrepancy or customs duty is to be paid i should have been contacted before retaining the parcel or they should have contacted me so that i could do the needful from my end to clear up any issues if there.
I am still waiting for it to show up.
How do i go about it?

Help please.

Thank u

Anamitra