If you check the Slot Booking Demo on VIT website, you can see there is a Forgot Application Number and Forgot Password link. You can click the link for Forgot Application Number once the slot booking will be active tentatively in the third week of March.

Please see the demo at http://www.vit.ac.in/btechadmissions/viteee2018

Dear Parishkrith,

You can contact to the officials regarding your issue.

If you want you can write a mail at ugadmission@vit.ac.in

Good luck!!