Money from GiftCard is gone?

Try this https://support.xbox.com/en-US/billing/xbox-subscriptions/digital-goods-subscriptions-refund

You can check your transactions at http://account.microsoft.com If it looks like there are any errors or you still can't track it, you'll want to contact support and speak to
billing. http://support.xbox.com.contact-us

Hello,this may not be as helpful but i would recommend what @Smwutches said,go into your microsoft account settings,transactions and see if you have anything. From there you may be able to refund something if money was indeed spent on your account,if not,contact
microsoft and/or Xbox support.

Hello, when you say the gift card cash is gone. Do you mean the option to pay via giftcard is gone?

no but you can buy Giftcards.

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Money on powerup cards is for trades and certain returns only.