Cognizant — didn't receive offer letter or any updates regarding it

Hi,
I had attended the interview for engineer trainee on february 2020, at cognizant technology solutions, manyata tech park, f2 second floor, nagawara bangalore. I had completed my technical as well as hr interview and had signed the paper as formality. I didn't receive any update still. I was told by hr that i was selected and i would be receiving my selection mail and my offer letter. Please let me know about it.