There, I think they did not count the work experience. If I were in your shoes, I would send them something like this:
Hello, my name is xxx, my application number is xxx and my UCI is xxx.
I ordered my GCMS note on xxx and received them on xxx. Upon reviewing it, I notice that the CRS point calculated was somehow not the score I got when I received the ITA. I think there might be some misunderstanding here and I would like to clarify it to help expedite the process.
Then I would attach all the work experience documents again, and ask them if it is sufficient and that you are more than happy to provide anything to help them make the decision.
Write it nicely and don't blame the miscalculation on them (though I think it's their fault hahaha) You can use ChatGPT for a little help but don't rely completely on them as if they read it and know that it is from ChatGPT, they will perceive it as insincere.
Oh one very important thing, check your work documents very carefully, maybe you miss something there. I remember someone I know miss the date on the Letter of Employment and it did put the application under "Review Required". In short, check your letter to make sure you include everything: header footer, company's logo, name, tittle, salary, date, duties, name and signature and email and phone number of the one who signer your document, etc.