Punjab National Bank [PNB] — money debited from my account in spite of failure of transaction

I would like to inform that on[protected] while filling up of form for all india institute of medical sciences pg courses md/ms/mch/dm/mds for jan 2018 session rs.1002.5/- has been debited from my account which is in pnb, garia branch, in spite of the fact that 'the transaction failed'. I will be highly obliged if you kindly look into the matter and do the needful to refund my money.