India Post — too late of speed post

Address:

800026

One no speed post material has been dispatched on 1/3/2019 from regional passport office, patna, bihar-800001 to bahadurpur housing colony, patna, bihar-800026, ie in same city. Even after lapse of eleven days item not delivered to concern but on speed post tracking no pp[protected]in, is showing that material delivered on 11/03/2019, next day i inquired it and found material still laying in post office, why such happen? Is it time taken is genuine for speed post?