We're sorry for the trouble. In rare cases, the payment process doesn't complete properly and your plan doesn't switch over.
First, open the settings screen and tap "Premium Service" → "Restore Subscription". In most cases, this applies your plan.
If it still isn't applied, restart your device and try "Restore Subscription" once more.
If that doesn't work, make sure the Google Account signed in to the Google Play Store app is the same account you used for the purchase. Open the Google Play Store app and tap your profile icon at the top right to check.
If the problem persists, please contact us using the "Contact Us" button on the help screen and include the date and time of the purchase and the details of the Google Play purchase email (receipt). Thank you.