I didn't received any response for my CSE regarding with technical difficulties to attach files. It is 1 month and 18 days now. but for technical difficulties, they response 10 business days normally.
If you sent CSE, you should receive automated reply.
I submitted a CSE last week but I got an auto response.
You may want to try it again just to be sure.
CIC recommends not to send multiple enquiries. However, i believe that it's hard to wait without even an auto response. We might not know if their system missed your email.