Cognizant Technology Solutions — did not receive the joining date email

My name is sourav ghosh. I gave an interview in cognizant on 10aug 2019 to which i was selected but still now i did not receive any joining date. Whenever i am contacting the vendor they are saying that it is pending with the higher authorities. I am stuck in the middle of nowhere. Please look into it as it is causing a hell lot of trouble as i have to look after my family.