Indian Railway Catering & Tourism Corporation [IRCTC] — tdr filed 45 days ago but no refund yet even though train was more than 3.15 hrs late

I had filed tdr on 15/12/2017 and request for refund against pnr number [protected] for reason "train late more than three hours and passenger not travelled.", has been received and the reference no for this is :[protected]
Actual train arrived at boarding station 3.15 hrs late, still even after sending reminders by mails, money not yet refunded.in response auto generated mails are recieved saying that your tdr request has been forwarded to railways. One it is accepted, refunds will be made.
It is next to impossible to get railways over help line nos?
Kindly help me to take the matter to highest deciding authority and get my refunds.