Indian Railway Catering & Tourism Corporation [IRCTC] — Refund amount - indian railway

Address:	Chennai, Tamil Nadu, 600004
Website:	www.irctc.co.in

Hi, i have booked a railway ticket before 3 months to travel from chennai to kerala and return. For up i have got the confirm ticket. For return ticket it was waiting list 10 & 11. Before the train departure i am getting a message which has the details of guard (Note my ticket is in waiting list). I am sure that i cannot travel with online ticets and i came by another mode of transport. Today i got a msg from irctc that "the ticket cancelled, amt 670 will be refunded in your a/c with in 3-4 days". If you see when i book the ticket the total cost was 790, but the indian railway returning only 670 where is the 120 rupees gone?? Note that i have not cancelled the ticket, it's been automatically cancelled.