Air India — lost baggage

Address:

Chennai, Tamil Nadu, 600079

I'm making a complaint regarding lost baggage. We were a group of family travelling from Delhi to Chennai. I didn't receive one of my baggage at the airport and filed a complaint there in the office immediately. I was told I will receive it when the next flight arrives. A staff there gave a contact number but no response was given inspite of me trying to contact them multiple times. This behaviour of the staff is very frustrating and disappointing.
Tag no. of the luggage is AI395729. Hoping to receive a response atleast now.