GoAir — Flight timing changed from evening to morning without intimating over the call

With reference to the above-mentioned PNR N9Y5UJ my flight was scheduled in the evening on 15th of JULY 201 which was changed to early in the morning without informing me over the call, , , owing to which i missed the flight.

Since the day i booked the ticket, i continuously recieved spam msg of you informing the evening time of my flight then the last msg was about rescheduling of the flight to early morning which i couldn't go through.
Why have I not recieved any proper call from your end?
You are requested to refund full amount of my money within 15days of receiving this email.