Cognizant Technology Solutions — not received offer letter from cognizant

I appeared for interview on 16- dec-2016 at pune location for msbi technology. After two rounds of technical and managerial interview in hr round after discusion about package and location i have been told that i will receive offer letter within a week.

But still there is no offer letter from them. Company like such a stature having worst recruitment process... Unbelievable.