My children uses a lot of games on App without my permission
iPad (6th gen) WiFi, Cellular
That’s not a valid reason to request a refund. Take the device away from them or set up parental controls. You can read more about it here.
Use parental controls on your child's iPhone, iPad, and iPod touch - Apple Support
Try applying for a refund here - Request a refund for apps or content that you bought from Apple – Apple Support
Or Contact Apple Support
You can request a refund, but it may be denied
Excuse me. you got me really disappointed. it’s a lot of money like $50-60 dollars. I would need request refund. I’d like to
speak with customer service. what’s the phone number, please?
I stand by what I said. You need to control your kids. Apple is not responsible for their behavior, you are.
Refund
