Board Thread:Questions and Answers/@comment-71.211.18.86-20141230063829/@comment-24956068-20150102183502

from my experience with Invite Event, getting Gold Drop and Zombie from invite event for the second time will not helping you upgrading the level of those two, instead you will get coins even when your Zombie for example is in level 1.

the coins rewarded for replacing Gold Drop or Zombie you already earned will be automatically added into the coin balance with no notification nor any pop-up telling you that you got the coins, so make sure you know this too.

However, if you are really sure there are no coins rewarded from the invite event, you can submit an Inquiry to Customer Support of Cookie Run here: http://cookierun.wikia.com/wiki/Thread:8914