UPS = Delivery FAIL

I ordered an item last week and the vendor uses UPS. Which is fine as far as that goes, but there seems to have been a problem completing the delivery this time.

For whatever reason, my apartment number was left off the shipping address. The UPS tracking web page notes an exception to the delivery schedule but doesn't provide a workable mechanism for the receiver (the individual most likely to be tracking a shipment, I would think) to correct the problem. What I really want to avoid is having my purchase returned to the company I bought it from (which is UPS' default option after 3 failed deliveries). I can find no means of contacting UPS about this without an InfoNotice number (the number on the slip they leave on your door when there's no-one to receive the delivery) which I don't have because UPS can't deliver my package without knowing which apartment I live in to leave the InfoNotice slip at (or possibly even just go ahead and deliver my package). The old Catch 22; you can't do what you need to because they can't leave you the necessary for you to do ...

I really don't want to take time off from work just so I can hunt up their local office and go down there in person.

Sort of defeats the purpose of shipping with them in the first place, doesn't it?

Update 1/5/10: Credit where due; UPS persevered, solved the problem and made delivery only one day later than scheduled. I still think they ought to review their customer support set up, but they got it right in the end so "well done" for that.