You cannot get a refund on World of Tanks. However, if you purchased it through Steam, there is the option to request a full refund for this game by following these steps:
1) Open your steam client and go to Library in which you will find Games not installed.
2) Locate World of Tanks and right click on it selecting Properties.
3) Click on the drop down box that says “Refund” followed by clicking “Request Refund” button. Then follow up with filling out an email detailing why you would like your money back as well as whether or not they should accept the request.