Student — reduce my balance

Dear Sir, On 13.09.2013 i made online fee payment for gate exam registration of Rs.1500/- through my union bank of india net banking. My transaction was failed with error "Reasons: net disconnect!We are unable to process your transaction.Please contact us at [protected]@billdesk.com for any queries". But the payment is done successfully and the amount is debited from my account.So what should I do now? .please reply me at my e-mail mentioned below. Thanks & Regards rajneesh kumar. ([protected]@gmail.com)