Cognizant — no contact from hr about offer letter

Address: 500081

Website: www.cognizant.com/india

Hi sir,
I have gone through interview process on 1 december 2018 at cognizant technologies, hitec city, madhapur office scheduled by alchemy techsol india pvt ltd. And the hr contact person name was moin. I have cleared my technical round. After that they forwarded me for hr round same day and the discussion was done but they said another hr person will contact me further.
Its more than 15 days and nobody from hr team communicated with me. Kindly help. My contact number is [protected]