Finally, on 19-07-2017, IRCTC refunded the amount which was due since 20-01-2017.
After posting this complaint on this site, I emailed IRCTC at "
[email protected] " .
I got the automatically generated response from their side but no further step was taken from their side.
After 15 days, I again emailed them with all the attachments of my previous emails and and the TDR summary PDF file.
Then after 5 days they responded with a confirmation email that my problem has been taken into consideration and they will refund the amount in next 3 working days.
So, whoever is reading this and facing such issues, my friend, keep sending them emails with all the evidences you have . Don't lose hope, sooner or later they have to respond.
Regards.