Lost/ Delayed Baggage

I would like to put forward a formal complaint for the mishandling and the worst customer service attitude shown by your staff with regards to our lost baggage and the subsequent trauma that we are going through at the hands of your staff in Delhi Airport.  
 
My wife who took the connecting flight from Melbourne to Delhi via Jetstar and China Southern on 6/12/17 flight Number JQ 504 and CZ-326, landed in Delhi, we filled the baggage delayed form and requested the staff to process the request to Sydney airport so that our luggage could be returned to us but your staff has shown no customer service attitude and has repeatedly tried to delay the whole process by advising that the night staff has said this and then the morning staff says that the night staff has done nothing.
 
The worst kind of document handling can been seen in the form itself where no File reference number has been provided to us by any staff. My wife has called your office in Delhi about 1000 times now and each staff says something completely false. Last we were told was that they could see the file in their system and they are sending a request to Jetstar who has the baggage with them and are waiting for your staff to send them a request to send the bag on the next flight to Delhi so that it could be delivered to my wife but I spoke to ‪Jetstar ‬and they have advised that they have receive no such request and there is no case number even showing in the system from China southern for our form that we filled. This is an appalling behaviour and would request your direct intervention and help so that our bag is sent to us on the very next flight to Delhi.
 
My wife has gone to India for her medical treatment and all her belongings are in that bag including all the medical reports, MRI scan CD and other doctor documents but as we have not got the bag so she cannot visit the doctor to start her treatment. I will hold Jetstar and China Southern responsible if her condition worsens due to the incompetency shown in handling this matter by your staff.
 
I will certainly appreciate your quick response in this matter and our baggage be delivered to us.