[Resolved]  Indigo Airlines — Refund and compensation

I had a flight from Delhi to Heathrow via Istanbul on 31st October, 2022. The Departure time was 7 am. When I reached the airport at about 5:30 am, I requested the officials at the gate to allow me to enter in priority but they denied. I waited in the queue and entered at 5:40am. I quickly rushed to the Indigo counter as this flight was operated by Indigo along with Turkish airlines. When I reached the counter the Indigo officials told me that this flight has already departed at 5:30am and there was no other flight at 7 am. I told them that there was no call, text or email about change in timings of the flight. I requested the officials to please recheck as I had about 1 hour and could rush to the gates. The Indigo officials bluntly told me I should have come 5 hours prior to departure. I was confused as I am a frequent flyer and even during COVID passengers were asked to come only 3 hours prior departure.

I requested again to talk to their senior and they directed me to another official on the last counter. He also told me the same that the flight had departed at 5:30am and there were no other flights. I requested if they could arrange the next earliest flight so I could take the connecting flight from Istanbul but he said that was my problem and he could only arrange a flight the next day. I was really upset by now. I went back to the previous officials and requested if they could help in any way but they bluntly said 'No'. I was really shocked by the treatment as I am a frequent flyer and this was the first time any airline service official was so rude. On the contrary, officials are asked to help passengers marginally even with less than 60 minutes prior departure. Usually they use polite words like, "I am sorry sir but I cannot help you with this" or "I apologize sir but there is nothing I could do ...", But that was not the case here.
Anyways, I then had to book another flight instantly which was very expensive at the airport. I tried reaching the customer service for cancellation and refund in the Goibibo app as I had booked from the app but the website was not responding even after multiple attempts. I have tried contacting Goibibo again but it says they don't work in this region (UK). They called me through an unknown number after many weeks which I couldn't receive. They mailed me about the missed call, to which, I replied that I couldn't receive it unfortunately and I was looking forward for another call but they didn't call back.
The SOP of additional 15 minutes resulted in two missed flights i.e. Delhi to Istanbul and Istanbul to Heathrow, costed me another flight that was expensive as was booked instantly and several hours of Physical and emotional shock as I came to the airport directly from night duty.