Cognizant Technology Solutions — cognizant interview status as "select" from cognizant talent acquisition (tag) team - still not received offer letter

I had completed my face to face technical round (Hadoop developer) and hr discussions on 8th of september 2018 at cts kandanchavadi chennai location. And i had received a mail "interview status as select" from cognizant talent acquisition team on 18th of september 2018.

And after that i received a call from cts the very next day i. E, 19th of september explaining that the hadoop developer role is in hold and asked my confirmation for processing my candidature as hadoop admin. I confirmed them i am okay with that but after that i haven't received any mail or offer from their side.

I have sent several mails to the concerned people but they haven't replied yet. What will be the possible solution for this???