Paterson Public Works Department

I've been trying to fix my sidewalk for 4 weeks, public works need to go by and cut the roots of the tree that cause the sidewalk to move up. I got my permit already and I already dug up the side walk. I've been calling non-stop for the last 4 weeks because the sidewalk cannot be open like that for a long time, and every time I call all I get is the running around, excuses, etc. etc. Who can I report this matter because obviously I can't solve it through Public Works? Does anybody knows any city agency that I can report this horrendous service?