India Post — International parcel via dhl undelivered

My parcel with tracking cl[protected]de was sent via dhl international paket from germany on the 29th of june, 2016. it reached india on 18th of july and then cleared customs on the 23rd of july, 2016.
I have tried to contact kolkata foreign parcel and they replied that they did not receive it and it has been dispatched instead back to mumbai. i then tried contacting mumbai foreign post on 28th and they say they have not received it either. i do not understand this at all. this is atrocious service. shame on you, india post.
I have waited for this parcel for almost 1 month and am beginning to get worried. please send me info whether it has been dispatched from kolkata to guwahati.
Https://nolp. dhl. de/nextt-online-public/en/set_identcodes. do? lang=de&idc=[protected]&rfn=&extendedsearch=true
Http://ipsweb. ptcmysore.gov.in/ipswebtracking/ipsweb_item_events. asp? itemid=cl[protected]de&submit=submitshipment number:[protected]
International shipment number: cl[protected]de
My address (as mentioned in the package) is:
Bhaskar thakuria
House no 28, 1st floor, zoo road, manik nagar
P. o. dispur
Guwahati, assam
781005
India