Indian Railway Catering & Tourism Corporation [IRCTC] — ticket refund

I had done reservation in train no 13005 from moradabad to jalandhar on 13 oct vide pnr no [protected] and the seat was confirmed on12/13 oc. T. On 12 oct i received sms from ad-irsmsa at 2..46 pm on12 oct that the train scheduled to depart hwh at 1910 hrs on 12 oct had been rescheduled to depart at 00.15 hrs on 13 oct ie a delay of more than five hrs.
On 13 oct, on checking the train status on irctc app, it informed that the train was diverted from hwh to burden. Under such uncertain condition, i cancelled the reservation vide id no [protected] in order to make alternate arrangement.
I was allowed only 50% refund whereas cancellation was necessitated because of delayed rescheduling of the train. As such full refund is requested.