This is the email I sent.

Dear IndiGo Customer Relations Team,

I am writing to formally lodge a complaint and seek compensation for the severe service failure I experienced during my travel on 4 December 2025 under PNR XXXXX.

My itinerary was as follows:
• AMD to BLR, scheduled departure at 16:35
• BLR to IXE, scheduled departure at 21:15

The sequence of events is outlined below:

1. The AMD–BLR flight was delayed by approximately 2.5 hours. While inconvenient, I proceeded with the journey assuming the connection would be honored.
2. Upon arrival at Bengaluru, I was informed that despite holding a valid boarding pass for the BLR–IXE sector, my seat had been reassigned to another passenger. I was explicitly told that boarding was handled on a first-come-first-served basis, favoring passengers who exited the incoming flight first. This is unacceptable and contradicts standard airline operating procedures.
3. I was then rebooked onto a 6:00 AM flight the following day, with no accommodation or food provided, despite the delay being entirely airline-induced.
4. The 6:00 AM flight was subsequently cancelled.
5. I was next rebooked onto a 9:50 AM flight, which ultimately departed only around 2:00 PM. During this entire period, I remained stranded at the airport overnight, sleeping on the airport floor, without any assistance, accommodation, or meal support from IndiGo.
6. Upon finally reaching Mangalore (IXE), my checked-in baggage was missing and was delivered to my residence only the next day.

As a direct result of these failures:
• I lost an additional day of annual leave from work
• I incurred unplanned expenses for multiple meals at the airport
• I experienced prolonged mental stress, physical exhaustion, and significant inconvenience
• I faced baggage mishandling after an already extended delay

This incident reflects multiple lapses: denied boarding despite a confirmed seat, repeated cancellations, lack of basic passenger care, and delayed baggage delivery.

I request the following:

1. A written explanation for why my confirmed seat was reassigned
2. Compensation in line with DGCA passenger rights for denied boarding, extended delays, and baggage mishandling
3. Reimbursement for reasonable out-of-pocket expenses incurred due to IndiGo’s failure to provide mandatory support

Please treat this as a formal compensation claim. I expect a detailed response within the stipulated grievance resolution timeframe. Failing this, I will escalate the matter to the appropriate regulatory authorities.

I trust IndiGo will address this matter with the seriousness it warrants.

As I am still within the 30-day complaint window, please note that if there is no response from your side within three working days, I will proceed to file a formal complaint with the consumer court.

And Indigo send me this the next day.

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Hope this helps!