Hello, v4x:
I believe the full street address is:
Sponsorship (Spousal)
Case Processing Centre - Mississauga
2 Robert Speck Parkway, Suite 1200
Mississauga, ON L4Z 1H8
Did you put the postal code as well? Shouldn't be a big deal if you didn't but good if you did. From what I understand of processing centres, the "Sponsorship (Spousal)" part is important to make sure your package is promptly routed to the right office so hopefully you had that on there...
We all feel your frustration and worry. CIC isn't inspiring a lot of confidence in their efficiency but don't despair just yet. They're obviously running way behind schedule so most likely that's what's causing your delay. Hoping for the best for you.