India Post — speed post letter is shown "address not traced"

Address:

Kolkata, West Bengal

We are sending some court papers from the sub-divissional court of Barakpore, kolkata, west bengal to Netaji para, uttar shantinagar, Dabgrame 2, Thana - Bhakti Nagar, at Siliguri to Mr. Debasish Roy( the address, adapted from his Adhar Card), But one of his relative is a workker of that post office, is never letting it to deliver. It has shown Address not traced, thrice.