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iMore Question i was at a picnic with my 8 year old daughter and we bought some coins for 6 dollars for pokemon go and she ended up making a bigger purchase
Welcome to iMore!!
Ouch... sorry that this has happened. I've got kids and its been done many times on my account as well.
There is a great article that was posted on iMore awhile back which gives you different options for reporting the incident to Apple.
How to get a refund for iTunes or App Store purchases | iMore
Good luck!!