Nptel — Refund of 1000 rs

Website:

www.google.com/url?sa=t&source=web&rct=j&url=nptel.ac.in/&ved=2ahUKEwjC06a4wp_9AhXE8DgGHfEOAcwQFnoECAwQAQ&usg=AOvVaw0vSuujSoj8BxYECFWbfhwm

I registered for nptel exam in python for datascience on 17 th feb 2023 at 7.48.I paid money through upi Id payment method and amount 1000rs debited from my account.But its showing payment unsuccessful.so I tried again with debit card option and its successful and another 1000 rs debited from my account. I kindly request nptel to refund my initial payment of 1000rs back to my account with ref 304.please solve my problem as soon as possible.