GoAir — cancellation of flight previous day of departure

Address:	North Goa, Goa, 403515
Website:	GoAir

My daughter and her two friends had booked an Indigo flight Goa to Mumbai on the 5th July 2018 and return Go Air flight G8 379 return from Mumbai to Goa 06/07/18 on the 12th June 2018 through Ease my Trip.
(booking Reference t4cvvv)
On the afternoon of 6th July, as they were boarding the flight to Bombay she received a message that the flight is cancelled, no reasons given.
On arrival at Bombay airport, they were told to take the refund and buy another ticket by another airline. This was so much more expensive being previous day which they refused and so very reluctantly Go Air gave them an alternate flight G8 375 from Mumbai to Goa for the following day 07/06/18 at 5 a.m
All three passengers are Doctors gone to answer an exam. They were supposed to fly back soon after the exam on Friday night. They had to report to duty on Saturday which means for no fault of theirs they would not be able to rest being deprived of the night's sleep.My daughter was on duty on Saturday night
They do not live in Bombay.
I tried calling the Go Air Consumer helpline spoke to Mr Sangram. He advised me to send an email to goair.
I sent an email to GoAir after speaking to their Consumer Care representative. I received this reply, " Your service request number is G[protected] and our agent shall respond to you soon." They have not responded till date.
The three of them had to wait so many hours.( Original time of departure 22.10 hours on 6/7/18 and actual departure was 5.00 hours 7/7/18)
Go Air should compensate them adequately.