Cognizant — Regarding offer letter update

Hi This is Jahnavi, i got an offer letter from cognizant on july 20 i even got access to cognizant portal after that i submitted my documents for verification but on August 9 i got a mail from cognizant specifying that name, and my education qualification was typed wrong so they said they are going to cancel existing offer and issue an new offer letter before or on August 15 but till now i didnt got any respones from them. I am not even able to login online portal.i am not able to understand what is the problem