Problem in online registration

While registering for online examination form, I am facing problem. The menu says that if my regn no and date of birth does not match, I can register as a provisional candidate. My regn no. and DOB does not match (God knows why), but as instructed in the menu I have put in all the information and clicked the 'submit' button. 2/3 days have passed, but till now, my login and password have not been sent to me. I have sent mail intimating the problem, but til now no reply has been received. Can anyone help me pls.