India Post — Document Held At customs - Canada

My international courier Tracking number ET[protected]IN with India post is stuck in Canada Toronto
custom hold and extra information showing as "awaiting presentation to border agency/s"

The tracking shows awaiting presentation to border agency/s. Its been almost 13 days since the document reached Canda, upon checking with customer service they cannot help us or update us in this regard.

Please resolve our query why it is held at border, it is just a document for WES Canada.