@CherAmie I have on my GCK account Final decision 31 March but have not received anything. I have called IRCC countless times and they have told me all stages have passed but nothing has been sent to me. Im not sure in your experience or knowledge if you have any insight. Will appreciate any input
To get a few obvious things out of the way, is all of your contact info (especially email) up to date with IRCC? Have you been checking your junk/spam mail? It's possible that if you did not respond to an initial PR Confirmation email that they have put your file on hold or, as they did for one person I know, returned it to Whitehorse assuming that you might be out-of-country.
I would do all of the following because I don't know what the issue is:
1) Send a webform outlining your situation, ask for an explanation on the cause for delay and/or next steps, and provide correct contact information just in case there is an issue with an email address, etc.
2) Contact the MP for your area and ask them to look into the cause for the 3.5 month delay.
3) Contact the IRCC call centre again and ask them to send a note to the correct area that it has been 3.5 months since a decision was made and you would like an update as to why or what, if anything, you need to do.
Given that that all of the stages have 'passed' we are assuming that you have or will soon receive PR. Best wishes!