Indian Overseas Bank — My money got debited after a failed transaction

Sir,
My money got debited after a failed transaction.when i was paying for university fees at first 1850/- was debited but payment status was seen failed.at an another attempt the payment was successful and money was debited.the 1850/- rs first debited has not been received.it has been 3 working days since the money got debited from my iob account.pls give an attention to this problem