Air India lost my baggage . Need guidance

Sorry for the tag , couldn’t find a suitable one .

I am a student , studying abroad . On my domestic flight , the airindia team put my checkin and cabin bag together and asked me to collect it in Delhi , from where I was gonna continue my international flight . But my bag didn’t appear , after asking 8-9 staff members , everyone confirmed that I will get my bag on my final destination .. which didn’t come as well . Thankfully , due to better tech in abroad , they were able to scan and confirm that my bag is still stuck in Delhi . I did file a claim .. but due to so much stress I didn’t copy the reference number . Thinking that I will get a confirmation via email or sms as I have information for both .. but I didn’t . Now I’m only able to contact airindia via the bot cause they don’t have any customer care .. which is extremely frustrating.

I’m not aware about the regulations and how to proceed further . I do have proof via the e boarding pass and the bag tracker on their app that my bag never arrived my final destination .

Please lmk if you have experienced the same or if I can do anything more in this situation