Cognizant — offer letter still not yet received

Address:

10-1-502,st no 7,khairatabad,Hyderabad, Hyderabad, Telangana, 500004

On june 3 2019 i attended an interview in cognizant ie., raheja mindspace 12a building for insurance process i have cleared 2 rounds and they sent an email for the manager round on 10th june but it didn't happened and again they conducted on the next day which is 11th june, i have cleared that round and got selected, hr sent me a form which includes basic details and live photo and she said to wait for 2days to get the offer letter but i didn't got, i called her about the status of my offer letter she said that my mail was already exsisting in their data. That means she said that you already got offer letter in the march for some other role but you rejected it, i was not informed this by mail or phone. She asked me to provide an other mail id, i gave but i didn't got the offer letter and the joining date is june 20 2019. One of my friend also got selected he said, i resigned in my previous company now i'm left with no job