Kikir Tiger

Submit a ticket and they will confirm if you've done it or not.
http://support.z8games.com/index.php?/Tickets/Submit

You need to login with the account you've done the event with first. If its this this one. Just go to link and follow the steps
Choose CrossFire Support

Other as its neither of the above

Type a subject. November Anarchy event would work.
Details.. That you completed it but you didn't receive your rewards or 1 of the rewards depends on your case.
If you have any proof like a screen shot or something that you've completed it
Add file

choose file

Then Submit.