Hello dudelooks,
Did you receive any e-mail or letter from Immigration Canada as your AOR ? If so, perhaps that should explain how immigration would communicate with you.
From your post it seems similar to my case and YES your file has been shifted to CPP-Ottawa Branch to speed up the process and further communication will be with Ottawa location.
On your PGWP, if you convince your employer / employer agrees to keep you for another 2 years, you should file an application for LMO since it takes 4-8 months after Medicals and it takes around 4 months to get LMO Permit.
You dont need JOB AD since you have PGWP [paste a clipping from website- lemme know you need help with that]
Been there done that, hope that helps