Complaint Review: CHINA AIRLINES

I traveled to San Francisco Airport by China Airlines on 10/23/2016. China Airlines misplaced 1 box of my luggage and I filed a Property Irregularity Report with an China Airlines luggage staff. I kept an original report. I've been contacting China Airlines staffs too many times for almost 4 months by calling, emailing about my luggage status and asking/wanting to file a claim form for compensation but China Airlines staffs keep moving/forwarding to back and forth to different departments, gave me a fake phone number which is (650)821-8888 (nobody pickup the phone, no answering machine, a wireless number). I ran out of my patient after almost 4 months, so I'm looking for any agencies/authorities office to help a consumer/traveler like me.