Konkan Railway — less amount refunded from e-ticket cancellation

Address:

Mumbai City, Maharashtra, 400058

I had booked e-ticket pnr no.[protected] for travel from mumbai to chiplun on 13 april 2018 for rs 160/- as the ticket was wait listed and did not get confirmed it was cancelled. I was told that the full amount would be refunded. I have got message that only rs 100 is refunded. Please provide reason of not refunding full amount of rs 160. Thanks f. B. Lobo