+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
Did you send it with any sort of tracking?

You can try to log in here: https://services3.cic.gc.ca/ecas/security.do

Use your UCI number and fill in the rest of the form. If something comes up, your application was received and the notice didn't make it to you. If nothing comes up, it hasn't officially been received yet and you just have to wait a bit longer.

edit: fixed link
 
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