Cognizant — on portal issues

Hello team,
This is immanraja from hosur, tamilnadu. I have attended an interview on 2 dec 2017 at koit, salem. I got my offer letter on 18 dec 2017 and also i got date of join on 24 feb 2018 at cts, kolkata. I accepted the doj and done my on portal tasks too, but i am unable to complete the gratuity nomination form, actually i completed but it shows pending, i was waiting for the on boarding pass till at the last minute but unfortunately i am unable to get. Even though i attended the first day but they send me out due to on boarding pass and also they mentioned i didn't accept the doj. Lot of difficulties i have gone to kolkata from tamilnadu, they refused me to join on the date due to those issues, so i returned back to my native.