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I went through all your posts
this is what i suggest:
Do you know the format of experience letter specified by IRCC? Ask your employer to provide you the experience letter in IRCC format, if they are willing to help you. Preferably prepare it yourself and submit it to your employer for any corrections and get it signed and stamped. Don't forget to type the name of the person signing it.
Then raise a CSE explaining what you find in your GCMS notes and you want to rectify it by providing a new job experience letter. Attach the letter to this CSE.
Here is the link for CSE, it is called CIC webform
https://secure.cic.gc.ca/enquiries-...se-cas-eng.aspx?AspxAutoDetectCookieSupport=1
I hope it helped.