I received the following format from someone in a chat group once and was told that it would get the desired response from IRCC.
So far I've used this format twice and both times have been successful.
Dear Sir/Madam,
I am <name and surname> with application number Exxxxxxxxx and UCI number xxxxxxxxxx.
I wish to inquire about the status of my application and I would be grateful if I could get responses to the following questions.
1. Eligibility passed? When?
2. Criminality passed? When?
3. Security passed? When?
4. Background check passed? When?
5. What is my Visa Office?
I look forward to hearing back and would appreciate any update regarding the above questions.
Thank you in advance.
Yours faithfully,
<name and surname>
Hopefully, it will get you the desired response