Cognizant — offer letter pending from cognizant

Address: 560037

I had my interview on 10th march 2019 in bagmane tech park bangalore for java developer. After hr salary discussion i was told that i will get offer letter within 12 days.

I send a mail to hr but did not get any reply from them. Idont have hr's phone number.

Its has been 23 days since i had hr discussion, should i expect something or move on?