I have had past experience accidentally upgrading a cannon to lv. 10 when I was saving for my first X-Bow. I quickly cancelled it but got half of what I spent!! I'm sure this has happened to other players (maybe not exactly) and have an idea! Within 5 minutes of upgrade time you can cancel for FULL refund, and after that time you can only get half... CONSIDER THIS!! Clash on all CLASHERS!

