Well below I have given you the contact details for the NMAT conducted by the GMAC so you can have a look

NAMT Contact details

Customer Service
For Registration form and payment related queries

Phone Support: +917863008300 – Monday to Friday (except public holidays - 9:00 AM to 6:00 PM IST)

Email Support: nmatsupport@gmac.com
For Exam scheduling and Rescheduling related queries

Phone Support: 0120 4397855 – Monday to Saturday (8:00 AM to 6:00 PM IST) (Except public holidays)

Email Support: nmatbygmacsupport@pearson.com

For NMATPrep by GMAC™ online practice exams related queries

Phone Support: 082878-03040 – 7 Days a week from 9 am to 12 am IST (15 hours/day, except public holidays)

Email Support: support@mettl.com

To enquire about the privacy policy, email NMATprivacy@gmac.com

NMAT Is Accepted by the following universities

NMIMS University, Mumbai, Bangalore, Hyderabad
Alliance University, Bangalore
Amity University, Delhi NCR
Ansal University, Delhi NCR
ICFAI University, IBS Business School, Hyderabad and other locations
Mody University, Rajasthan
BML Munjal University, Delhi
Shoolini University, Chandigarh
SRM University, Chennai
Thapar University, Chandigarh
VIT University, Vellore
Woxsen School of Business, Hyderabad
Chitkara University, Patiala
University of Petroleum & Energy Studies (UPES) , Dehradun
Hyderabad Business School, GITAM University, Hyderabad
Institute of Management, JK University, Jaipur
Shiv Nadar university, Greater Noida
GITAM School of International Business, Visakhapatnam