New license wipes out remaining days on previous license

I have six machines running Norton Internet Security 2011.  When I set these up, three have one license and expire on one date, and the other three a different license and they expire on another date. 

 

I purchased new licenses and I did not realize that when I activated the new keys it would wipe out any remaining days on the old license.  I'm not too worried about a few days that were remaining on three of the machines, but the other three had till Nov 2nd left on them. So, I lost over 60 days of service.  (I only did one of those three that expire on Nov 2nd today, and when I saw what happened, I did not activate the remaining machines). 

 

Is there any way to recover the lost service days?