I booked the ticket from Bangalore to Delhi in Feb-2014 and due to some prices change the ticket stands cancelled. It been more than a three months now since they have not processed the refund of Rs 8136/- . Half of the time their Call center number will not be responded and in case if you are lucky enough to make it, they will have the same old story that they will process the refund but their will be no process of refunding.
No doubt that they have the lowest prices airline but in case if your ticket get cancelled due to some reason then be prepared to book a alternative ticket from them or loose the money.