Please contact a game advisor about this then. Follow the link: https://help.ea.com .
Then do the following:
Click on: Help with a Game
Then in the bar that says Search all Products, Type: Tapped Out
Click on the Tapped Out icon
Select a topic
Scroll down to "contact us" then select a platform
An option to contact ea will come up
August 2014 - last edited August 2014
I'm having the same problem. iPhone on iOS 6. Successfully completed the attack part of the quest but even after using 2 cheaters to defend it still says 0/1.
EDIT: The in game update that just happened didn't fix the problem