Cognizant — Regarding mail for onboarding or joining in cognizant (genc)

Address: Plot No 129 to 132, 1 & 2nd Floor, Block 1, Dlf Building, Gachibowli, Hyderabad - 500032, Near Aphb Colony

My date of joining was 18th december, 2021. At that time my college exams were going on, so that is why I have asked for delay my date of joining to february 15, 2022. I haven't received any mail after that regarding joining.
Please help me in to get through this. I have mailed to cognizant but didn't received any mail regarding the matter.