Hi Simp,
Office name is : CIC Office, Toronto (google it to get the actual location, near by St-clair subway station). There is no separate department, as soon as you go there, you have to take your number from a machine and wait for you turn. Once they call your number, you can go to the officer and explain him/her about your situation. Try to impress the officer, like you don't know any thing about your application status and mention him the time frame of your application (like 16 months for my case). Then they will take a look at your application either by your client id or file #.
Thanks,
seven