Postal Service — Non delivery of registered post

State bank of India has dispatched bank documents by registered post No EB[protected] IN on22 March at my postal address:- Lt Col Harbhajan singh, D/201 SUSHMA ELITE CROSS, P/O DHAKOLI, GAZIPUR Teh ZIRAKPUR(Pb) pin 160104.Same has not been delivered to me till date.Documents are impotant.I have traced the number many times as also requested the post master but no reply has yet been recieved.