National Institute Of Open Schooling — Not providing the refund

My wife's application is still at the enrollment stage and enrollment is not completed yet. I want to cancel the admission and get the refund but NIOS is denying doing so. My wife's registration details with NIOS as below. Name - HEENA FAIYAZ KADRI Reference Number - A[protected] Course - Sr. Secondary - Stream 1 Block 1 Registration and Payment Date - 2nd July 2020