I agree with everything stated by my fellow BOTL's above. 48 hours at -10 C or colder should do the trick. That sucks that you got infested! I was gifted some CC's that had one beetle hole in it and I immediately froze them. It is a good practice to freeze all of your smokes! There is a really good thread to read if you haven't already. It is:
http://www.cigarasylum.com/vb/showthread.php?t=7919