After making payment if you get the following response :

"Your earlier transaction was successful, contact merchant for further details. PLEASE DO NOT RE-INITIATE TRANSACTION."
Please Do not try to make another payment. Send an email to rmthelp@vssc.gov.in with the subject "[YOUR REGNO]: PAYMENT PAID BUT NOR REFLECTED ", registered Email address , POST NO., Advertisement Number. Payment Details will be verfied and reflected within 72 hours.