In our case in started off with an email from London on the 8 July saying:
Dear XXX,
As you are destined to the province of Quebec, we cannot commence processing your application until we receive Quebec Immigration Approval (CSQ/Engagement) We usually receive our visa office copy of the approval from the Quebec Government MICC. To date on your application, we have not received Quebec Immigration Approval, if you have received, the CSQ/Engagement, please forward us a copy of these documents.
Yours sincerely,
XXX
The following week I phoned MICC who confirmed the CSQ was approved on 11 July and that they sent a copy to London electronically.
We then replied to London's email above (with our file number) and asked them to confirm in writiing whether or not they had definately received it.
This is the reply we got:
Dear XXX,
Thank you for your recent e-mail.
Please be advised that the CSQ has been received by our office.
We will soon be in contact with further instructions.
Yours sincerely,
XXX
I doubt they would inform us if we hadn't chased it up to ensure everyone had exactly what they need to proceed.
Hope this helps