You should contact the IRCTC helpline once. Although this is not necesssary because, according to the railway rules, n case of e-tickets, the TDR is filed online before the actual departure of the train for availing full refund. And, the most important point is in case the ticket is cancelled or surrendered or if the request for refund of fare is filed online after the actual departure of the train, no refund of fare shall be admissible.