I called immigration today (It's been a year since they have received my app) and I asked about it. They said that the SA letter was sent back in April 2017. I have a representative who also didn't get the letter, however when they requested my Police certificate and Schedule A there was also a line saying that I should apply for a CSQ asap (document request for Quebec habitants) until MAY 2017 - my representative NEVER TOLD ME ABOUT IT. I could have called and asked for a second copy of it, instead she told me that I should wait... so I trusted her. Now my application is delayed. Immigration contact me again in regards of the CSQ a couple weeks ago and that's how I realized what happened. They said that's the only thing missing from my application for a final decision! This request takes 25 days according to the Quebec website. So now I get 25 more days of waiting for something that could be done already. It pisses me off because I paid a very good amount of money for this woman.
Anyways... I suggest you (and anybody who's is waiting for the SA more than 3 months) to call them and check why you didn't get the SA yet, maybe they sent it to you and you never got it like me.