Someone in Mississauga claimed it worked for them. Check out the Mississauga applicants thread. Someone claimed that the MP's enquiry also speeded up things. Could be a coincidence or could be not, we'll never find out.
I'm from the same office, and reached out to a lawyer last week. They suggested that given the recent announcement by IRCC about timelines and steps being taken to clear the backlog, I wait for six months. If I don't receive an oath but then, they would file it for me. It's not a cheap option. I have received quotes from lawyers between $1800 - $7500 so really don't know what the real cost of filing it is. I am certainly hoping I don't have to file it, & just have to be patient for the next few months.