Delhi University — Unable to download marksheet as the site show error

I have paid Rs. 500 for downloading my marksheet of secession may- June 2018 . But am unable to download the marksheet after entering the fee sleep number the second window opens but whenever I insert my date of birth it shows that it is incorrect but my date of birth is according to my certificates and absolutely correct. The window shows again again that the Date of birth is wrong . I have my documents verification on 9 October please help in few my marksheet.