Acknowledgement receipt is what they send as to let you know they checked your file in Mississauga, after which they send sponsor approval, so the received date would be when the application actually got to address usually in 5 to 6 days after you send it, it should say on AOR " we received your application for abc on xyz"
And a random suggestion People don't rush to do MP inquiry or GCMS or any other means of inquiry at least when you are just in 8 to 10 months since when you filed, specially if you know you missed some documents or were requested additional information, it would highlight you in wrong way.
Have patience.