I was charged from my card 740 usd

I was charged in a second one time 104 usd and 5 times 100 usd. Couldn't even to block my card. These purchases are not indicated in purchase history. All bills show apple itune, but I did not subscribe to anywhere, I checked my subscription list and did not find any paid subscription. I want to refund my money.

How I can refund my money

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