I tried calling them, but no one picked up the phone.

So a year and a half later, this problem is not getting better. I keep getting junk from local business who try to promote themselves but not looking at sings. Does anyone fine them ?

The city doesn't not check this site anymore, why it's still active it beyond me. Since they have activated the 311 system and mobile app, they have stopped monitoring this one.
If you have issues with businesses still leaving menus/circulars if you have a sticket, you need to report it to the L&I Circular Free Coordinator, Charlene Hartman - 215-686-2414 or Charlene.hartman@phila.gov. You can scan or take a photo of the flyer and email it, always include the address that the flyer was received as well as the date and time it was delivered.