Got a response from my 3rd CSE:
"Good day [Name],
Thank you for contacting Immigration, Refugees and Citizenship Canada (IRCC).
We verified the information you provided regarding the processing delay of your application and have forwarded it to the responsible office.
They will contact you if further information is required or if a decision is made on your application.
Furthermore, we can provide you with the following details about the status of your work permit extension application:
We are pleased to inform you that your application was approved. Your (Work Permit) was issued on March 27, 2019, and it will expire on March 27, 2020.
If needed, more information is available for you regarding
working in Canada.
We hope the information provided is helpful in assisting you with your enquiry."
So no update on PR and they just sent my request to Ottawa who have been ignoring my emails anyway but at the very least my BOWP looks like it's been approved (although no update on CIC yet). Baby steps at least. Goodbye implied status!