Hey Sweety,

Below I am providing you all the deails about how can you contact NTA ( NATIONAL TESTING AGENCY)

NTA Help Line Toll-Free Number: 18002669418

NTA JEE Main Telephone Number: 0120-3946612

JEE Main Helpline No: 7042399520,  7042399521, 7042399525, 7042399526

JEE Main Helpline Email :  jeemain-nta@nic.in

Gmail Id:  ntanationaltestingagency@gmail.com

Check if you have called their contact no.s and you can akso contact them on mail. Send them a mail they will reply you for sure.

Other than this here is the office address

Block C-20 1A/8, Sector- 62, IITK Outreach Centre, Gautam Buddh Nagar, Noida-201309, Uttar Pradesh (India)