Jet Airways — change flight without informing and without ticket

Hi,
We had a booking with jet airways which we made in the month of january itself. Booking details as below,

Your flight itinerary:
—
Outbound
Flight 9w 4947 - jet airways [protected]
Departure: mumbai, in (Chhaprati shivaji intl.) [protected]:50
Arrival: parijs, fr (Charles de gaulle) [protected]:05
Airline booking reference: 9w/oenubh
Booking confirmed, economy duration: 09:40

Baggage allowance: -
Stops: -
Operated by: air france, af
—
Flight kl 1228 - klm [protected]
Departure: parijs, fr (Charles de gaulle) [protected]:30
Arrival: amsterdam, nl (Schiphol intl.) [protected]:55
Airline booking reference: 9w/oenubh
Booking confirmed, economy duration: 01:25

Baggage allowance: -
Stops: -
Operated by: klm, kl
—

Return
Flight: kl 877 - klm [protected]
Departure: amsterdam, nl (Schiphol intl.) [protected]:25
Arrival: mumbai, in (Chhaprati shivaji intl.) [protected]:15
Airline booking reference: 9w/oenubh
Booking confirmed:, economy duration: 08:20

Baggage allowance: -
Stops: -
Operated by: klm, kl
—
—

E-tickets
—
Ticket: 589-[protected] - honrao revansidha
Ticket: 589-[protected] - honrao anjali
—

Following the above reference number when we checked on the jet airways website, it showed us mumbai — paris (Jet airways, operated by air france), just when they declared bankruptcy, we tried calling jet, but could never reach their customer support.
4-5 days after that around 20th april, when we tried to check our booking updates on jet airways site, we observed that our flight was changed from jet airways to air france (Now it says operated by joon), there was no notification from them about this, we checked it ourselves and found out the changes. We again tried calling jet airways but were on hold for more than an hour but couldn't reach any of their customer support to find out about the changes.
As it said air france (Operated by joon), we so checked the reference number on air france website, and it showed us the booking confirmation from mumbai — paris, paris — amsterdam and return amsterdam — mumbai.
We were happy seeing this that jet has transferred our places to air france since they are not able to do so. When reaching at the airport air france said jet airways did not complete your booking, they just routed you to us, but they did not issue you an e-ticket.

My parents were stranded at the airport and in panic on what to do next as they were told to make another booking if they wanted to travel. After reaching the ticket counter they said please make the booking online.
What are old people going to do in this case? Jet should have issued an e-ticket, if they were not capable of doing so why did they transfer the booking itself? If they would have not transferred we would know that the booking is cancelled.
At that moment we had to make an immediate booking which cost us 3 times the original ticket price (Orginal eur 1225).
My parents are blood pressure and diabetic, they were almost collapsed when they heard the rates 3 times (New tickets cost eur 3000). Somehow i was on call with them and had to relieve them and not to worry about the cost. I had to borrow the money as this huge amount was not possible immediately.
While speaking with my father and see him sweating at the airport the man next to him spoke with me about what to do next, relieved my parents to not to panic. I booked another ticket for them mumbai — istanbul — amsterdam

Finally they boarded the flight at 6:30 am after spending all night without sleep taking medicines at the airport. They finally reached amsterdam after 28 hours of their journey.

This was all because bankrupted jet airways transferred the bookings but failed to issue a ticket. If the were so incapable why the hell they transfer the bookings to air france, and also if they did, they should have issues a e-ticket.
This also caused us huge financial loss, as we had to book instant tickets.

Please raise a case against them and we would like to have compensation along with the original ticket refund price.

Thanks & regards,
Rohit honrao