Thanks for your response. As you can see above in my other reply, I wasn't able to be transferred to an agent. So frustrating. I don't have much time to call them as they only open from 8am to 4pm.Hello, I am on the same boat as you. I applied my post graduation open work permit extension on July, 2017. No update yet, I cant' help but called CIC centre, you can find their phone number at the back of your work permit. The things turned out to be, there is always around 20% of applicants will go over the average processing time and not sure what the percentage will go background check up, which is the file be sent to local office. You can google what does this mean, some people stuck here for a year...
I suggest you call them maybe you are lucky enough that you are approved but they just didn't put that info into the system, which explains why your eTA got extended until dec, 2019.