Go through DL.Com and file a complaint on there. Include bag tags and other key tracking numbers. The DL.Com seem to be more responsive. Also saves time on the phone.

I have never had too many issues with DL on luggage and I always check a bag. My only issue was when it took 50 minutes to bring out my two bags. The Baggage Desk person was the rudest person I have ever dealt with. I filed a complaint about her and recieved a call from a Baggage Claim Supervisor to get more details. She was very nice. Offered my miles for the issue. I declined them and told her it was nice they called and cared.

Now, I can tell you if you have to call TSA about your bag obviously getting inspected and TSA approved locks left off, they will never respond. I have a rolling tool box, which I expect to always get inspected(I am fine and glad they do). However on six different occasions they have left one of the two locks off and three of the times never put a paper in the box that it was inspected.