In these cases, you must contact Apple to resolve the issue, as it is the online retailer responsible for all payment issues. Our group, Movile, is the developer of the app, we only resolve technical issues relating to the application itself.
You can request reimbursement from Apple for the additional value you were charged by clicking this link: https://reportaproblem.apple.com
Should you wish to verify all charges made to your account, or you are worried that you were charged twice, follow the instructions under the topic Use the Computer to Manage Subscriptions at the following link to see your entire buying history: http://bit.ly/18cx5Jy
During step 5, select "Buying History" and "Show All".