Final experience sharing
Thanks a lot everyone for your comments.
There's two ways to solve the issue by myself.
1) Contact to Hertz office (not local in Germany, but the local in your home country...the service of Germany offices is horrible) --> then Hertz will provide AKTENZ # (file #) --> With the information, you can direct contact with police station in Germany
--> They would provide you with GiroCode or website to close the files or pay the fines
2) Wait, Wait, and Wait --> Germany police station usually close the files after 3 years (with the some luck, they may close the files in 6 months around)