ell-648 Said:
"Billing problem: Hi, I recently made a purchase and the money was taken out of my account, but it now says that I 'owe' the money. What can I do? I used a gift card and am unable to add any money onto it / refund since it still says that it is pending."
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Rid of "Pending":
You need to wait it out. When "Pending" goes away, it would be back. Refunds can take unto 30 days, like it or not.
Secure your Info:
Being scams is of big concern here, (A.)verify your devices, and (B.)Modify your credentials:
A. Verify your Devices:
Verify that all devices are logged in to your account, by using this link: Check your Apple ID Device List to See where you're Signed in - Apple Support
B. Modify your Credentials:
Having been stollen, someone lily has your credentials. So, by all means, modifying them.