Hello Mugdha,

Here the mail nfo.tcsionhub@tcs.com  of NATA send your registered mail ID and phone number so that they will help you further. 

Otherwise, there is a toll-free number(18002666282) call them and ask for your application number.

Do this as soon as possible.

All the best

Reach out to the contacts provided on NATA website. Based on the information that you would have provided while registering your applicattion sequence number can be recovered. Mail the authorities as soon as possible, if a contact number is provided then give them a call.