HappyEasyGo — reschedule of flight

Hi,
Just wanted to register a complaint with you. I had got my flight cancelled as it was scheduled on 30 th march, so i tried to reschedule it for 2nd may. The flight cost is same as i paid before, i rechecked the price with indigo website as well as your website, but while rescheduling the flight i am asked for extra 628 rs money, which to be frank is just rediculous way of ripping us of. If the fare difference is actual please send me the proof of that, we'll be happy to pay. Please look into the matter and do the needful
The flight pnr - dfd6yv
Booking id[protected]