@WPTO - I am exactly in the same situation. Today, on March 28th I also received a 1 year PGWP for a Full time Masters program of 16 months , over 4 consecutive terms, full time and no scheduled breaks (in short, ticking all the boxes for a 3 year PGWP). I also have ppt validity until 2028. No red flags such as unauthorized work etc. (Applied for PGWP on Jan 14th 2023).
I trying calling the IRCC number between 12:00 PM and 4:00 PM on March 28th, but after trying at least 20-30 times, I still could not connect.
I raised a webform and submitted all the neccessary docs such as Letter of Completion, Official Transcript, Completed Degree certificate and even wrote a letter of explanation. Within 4-5 hours , I received a mail from "CE CSC Do Not Reply" saying the documents have been added to the file.
I know calling and asking the agent to flag my application for reconsideration is the way, but Is there anything more that can be done ?
Thank you all for sharing your stories and hopefully we can emerge from this sad situation happily.