Srilankan Airlines — Flight delay by 6 hours

Dear Madam/ Sir
I took a flight from New Delhi to Paris CDG on Dec 21, with a layover at Colombo airport.
I have attached my ticket for your reference.
My flight was delayed by 6 hours.
I had to stay at CMB airport for 6 hours without food, without water, and without a place to rest for an entire night (from 22h25 to 6 am). I checked every lounge at the airport and nobody would accept my bank card.
No food was provided, nor water. These were inhumane conditions that you left us stranded in. Not to mention that I had an important meeting in Paris that I missed.

I wish to file a complaint against this delay of 6 hours and apply for a refund for my flight.

I had to return from Paris without getting my work done and I will have to fly back to Paris to do it. This has constituted an enormous financial burden on me, all because one flight got delayed by such a long duration.