To request a refund for your purchases on App Store and/or iTunes, visit https://reportaproblem.apple.com.
Find out more on exclusive promotions and new features, such as subscription management and billing history, in Apple Zone.
You can click on Apple Zone in the main page upon opening Touch n' Go eWallet.
You can also enter Apple Zone by clicking 【More】 at the Touch n' Go home page and find 【Tickets & Entertainment】 and click on the Apple icon.
Visit the Apple Zone FAQ page for more information.
Below are the articles that may be useful for you :
How long does it take for the refund to be credited back into the Touch ‘n Go eWallet?
How do I check my purchase history in the App Store and iTunes Store?