I finished in December with the promise of a letter from my coop-teacher and college supervisor. I have recieved them from neither. My coop-teacher will not reply to emails or anything so I've given up on her. I'm hesitant to bother with my super because she has so much going on.
It took a full year to get the one from my advisor and she just emailed it to me- thus I have no signed copy.
I feel your pain, it sort of makes you feel like they don't care but really it's a matter of priorities. I agree that you should persist with the stand back attitude (I don't want to bother you but...).
One thing I've already learned is you've got to fight for yourself because sometimes no one else will. Good luck!