Hi,

You did not specify the name of the exam about which you are inquiring about the Hall ticket Number. Please do so. So that you can provide an answer to your question. Before that check for the soft copy and all. You should have received a confirmation email and SMS after registering for the exam. Alternatively, you can contact on  the helpline number for that exam and describe your issue. They will assist you.

Hope this helps.

Good Luck!