Lufthansa — Bag misplaced not able to find

Hi,

My family was flying from Deutsche Lufthansa AG(LH) 760 from Frankfurt to Delhi date. Boarded on Sat 9 July and landed on 10th July 2022 on Sunday.
On Delhi terminal 3 we left our brown colour bag. Lufthansa told us that they will inform us about the bag. It's been 2 months we are trying to get in touch with someone to get the bag but it's useless. Can someone s help us in getting the same. Pls contact on [protected]