Hi Stolen Chalupa,
How did you ugrade from LPR to USC. Was it by calling USC or sending upgrade request letter. I am in the same situation, so...
Ummm yeah. This is a sore point for me. Learn from my mistake of trusting that the local office can send a fax. My advice is hit 'em hard from all angles... perhaps multiple times. At first, I got an infopass and went to the local office. The IO filled out a cover sheet and supposedly faxed in the form but I don't think it worked. I have seen nothing - no touch online. Finally I got my passport and today I called and got an IO on the line. I faxed again today to her. This was a local number. I have also sent in to the address on the NOA. I am not sure if this is the correct address but I trust it will eventually get to the correct department. In a few weeks I will follow up again especially if I see no evidence that the upgrade happened.
In summary use all methods:
Call the 800 number and fax in the request
Get an infopass and go to the local office
Send in a hardcopy
Follow up in a few weeks