Hi there!
So just to clarify- your file has been "complete" since 10/2 and you haven't had an interview at CCOM yet? I was confused when you mentioned how they said "3 or 4 weeks to hear back." If you received the email that acknowledged your application is complete, that's a good indication that it's at least with admissions and not sitting in some mailroom, seeing how someone had to physically review all your materials to make sure they were all there. In that case, I don't think there really is a rhyme or reason as to when they invite you for an interview. I went to three interviews within a 1.5 months of my application being complete, got accepted to all 3, and yet have not heard a WORD from PCOM (either campuses). A co-worker of mine heard back from PCOM immediately, but not one of the ones I heard back from.
HOWEVER IF you did interview and it's been over 4 weeks I think it wise to call them up (again) and explain this and maybe even ask to speak with the director of admissions (Michael Laken). After my interview, they said it could be anywhere from 3-6 weeks, so if it's been only 4, then maybe wait through the holidays? Not what you want to hear, I know. Maybe just express that you don't want to miss any deadlines, etc. Similar situation happened with me for NSUCOM...it was well past when I should have been notified (good or bad news) so I called and they told me they sent out my acceptance package nearly 3 weeks prior! If i didn't ask I could have missed the deposit deadline!! Not that I chose to go there...I just put down my deposit for CCOM!
Good luck and I hope they don't keep you waiting any longer!! Cheers!