Change to a new job- Inform Immigration Office?

[sandraqi]

Hi there,

My husband and i live in Toronto now. I'm a sponsor, We applied outland- Buffalo. we just sent our application on 7 Sept.2011.
My husband got a new offer from a company yesterday. He will quit the current job and start a new job in Oct.

At this stage, i think our application was delivered to Mississauga last week, we don't have File No. or other info. about our application.
Should we inform the Immigration for this change? Should we inform Mississauga office or Buffalo Office after we get File No. or sth like that?
How should we contact them?

Thanks a lot in advance!

[Kedeisha]

Inform Buffalo after your file has been transferred to them