Add funds to Apple ID
I have paid for funds but I didn’t receive balance
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Funds transfers can take up to 48 hours to complete.
Have you tried signing out of the App Store/iTunes, restarting the device, and then signing back in?
If necessary, contact iTunes Support for assistance. See the Apple Support articles below for contact information.
Apple Support schedule phone call
If necessary, try Twitter
https://twitter.com/AppleSupport. People have posted it may take an hour or more to get a response.