No customer service and no feedback

I flew with Lufthansa September last year. I haven't received my luggages (2 bags) on arrival in Hamburg. With the poor customer service in Hamburg and struggling 2 hours to find out who can assist me, I found a brochure to report missed luggage online. One of my luggage was sent back home, while the other one is still missing. Until now, they haven't responded to my emails about the missing bag. And I haven't received any compensation. I did a 7 month contract overseas without any of my luggages which was a big inconvenience for me.