Provisional registration for Inter CA exam for November 18

I was registering for Inter CA exam for November 18. Even I had entered WRO and DOB for new login.
But one message popped up on screen that
"Your data is not matching with our record, so you have to do provisional registration for login".
I am Direct Entry student. I have called on toll free number of Icai regional office. But call has not been picked up.
Should I register as per provisional basis?
What should I do after doing provisional registration? What are documents need to be submitted by post ?