I had a very bad experience of booking tickets throught IRCTC mob application.
This happened to me in 2016 when I have to go new delhi from kanpur I hav booked 2 tickets through mob app ticket have been booked successfully and payment have been debited from my a/c instantly, I was like wow this app is so fast but due to some emergency a day before leaving I had to cancel my booking so for cancelling the tickets they deduct some amount more than half of your booking amount and says your amount will be refunded in your a/c in few days but they didnt refunded.
I called & mailed to customer support they also said the same but no refund till date even after 1 year same thing happend again and again they failed to refund my rest of amount.