From the comments section re Kensington Post Office:
Hello fellow 11218ers,
Well, someone actually called me back from the complaint I sent to the USPS website. According to my new friend Gloria, if you are standing on line forever or otherwise outraged, you should call 1-800-275-8777 (1-800-ASK-USPS) and complain. You can also call the Complaint Dept, where Gloria works (but please don't ask for her by name, because that would get old fast) at 718-348-3900. Program these numbers into your cell phone and CALL. Call from the line, call when your mail is late or package isn't delivered. Call immediately and keep calling. Volume and timeliness are the keys here. In addition, document every complaint on the USPS website.
Interestingly, the people who work at the Complaint Dept have cameras where they can see the individual Post Offices, so Gloria actually said to me, "I'm looking at 11218 right now, and there's no line. This would be a good time to go." I found that hilarious. But also, if you call from the Post Office they can see what's going on and call the manager and send him out on to the floor. So basically -- if you are there, ask for the manager, and if he won't come out or doesn't help, call that number and tell them what's happening. If you get a slip saying they tried to deliver your package but you know they didn't, call that day and complain.Gloria was extremely nice and friendly. I have no idea if anything positive will come from this, but it couldn't hurt!
Okay now we know what to do! Follow SPs advice and program the numbers into your cell and call w complaints often!