need to cancel and get my refund with Kiddopia Full Access

Perhaps these articles will help;

See or cancel your subscriptions - Apple Support

Request a refund for apps or content that you bought from Apple - Apple Support

See javaliga’s answer. But to be clear, Apple will never charge you for unauthorized subscriptions or anything else. If Apple charges you for something there are only these possibilities:

• You authorized the purchase or subscription and forgot
• Someone you share an Apple ID with authorized the purchase or subscription
• Someone on your Family Sharing plan authorized the purchase or subscription
• Your Apple ID was hacked and the hacker made a purchase using your account. For this see—>If you think your Apple ID has been compromised - Apple Support