Indian Railway Catering & Tourism Corporation [IRCTC] — my full ticket fare refund is pending for train cancelled by india railways

Sir, for my pnr number [protected], doj[protected], train no-02842, my 2nd ac ticket was from source station mas (Chennai) to destination stn. Src (Santragachi). Train departed from source station as per scheduled time and after travelling approx. 90 minutes train stopped for 2 hrs and then we have been told by tte and also we have received message from railways that that train has been cancelled and will not go further and it will return back to source stn chennai due to caa protest. After that as per railways train cancellation rules railway is supposed to give full refund but they refunded only 50 % (Rs.3110) of total fare. (Rs.5950). I have send so many mails to [protected]@irctc.co.in but till date they keep on writing refund is under process.