MakeMyTrip India — Deliberate delay in flight change to increase fare difference

I have been calling the customer support since last 14 hours to change the travel date of my book PNR 69BF5I Delhi to Canberra. By consistently saying that their server is down they have refused to change my travel date or even cancel the booking. After being on call for 1hour at 12am on 18jan, they finally informed me that the fare difference is now 18000 inr. At 1pm on 17th Jan, the fare difference was only 100rs. I have been cheated and deliberately made to wait so that they can increase the fare as I am left with no choice but to pay.