India Post — My ordinary parcel not reach to my customer

Address:

C-75 ATPS COLONY., GMDC LTD., KUTCH., GUJARAT.

Hello..
As I said I dispatch my parcel with ordinary post from Nani chher post office, Gujarat to Ahmedabad but it isn't reach to it's destination after 15-17 days.. And as it was ordinary parcel I can't track it also.. Please help me regarding this matter, what should I do?
And the post office staff rudely said that " Why you trust post office ", " Don't trust post", "post doesn't come to your home to take parcel" Such like this rough answers I'm worried.. Please help me