App Store is double charging me. How do I get a refund?

I've been having problems with the App Store lately. Mostly on in app purchases. I'll go to buy an IAP and it will fail saying it can't connect to iTunes. So, I'll go to purchase it again and it goes through the second time.  When this happens I always get a double charge on my bill. How do I stop this from happening and how do I go about requesting a refund? This has happened three or four times now.
I'm on an iPad min/wr and a 5S.

Why does this thing think I'm on an iPad 3?

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