I have booked a ticket from Thane to Nasik Road for 13 June 2011. On 12 June evening when i checked the status of my ticket on 139 i came to know that the train is cancelled on 13 June between Mumbai and Nasik Road. (This was due to Darbhanga Kurla Express derailment In Kasara ghat). When i tried to cancel the ticket online, i got message that chart is prepared and hence file a TDR. Now i got just 50% refund and not full refund. As train was cancelled i must get full refund. What should i do?