Can you cancel an order

You would need to contact support and speak to billing. http://support.xbox.com/contact-us

Hello Tranierx,

Unfortunately, once you spend your Gems, there is no way to cancel the process.

Since the DLC dont come out till September you can cancel the preorder then remove your card. Here's how:

If you purchased something from Microsoft Store, you can cancel your entire order or an item in an order before it enters the billing or shipping process.

Note

These steps cover how to cancel orders and pre-orders from Microsoft Store. If you want to cancel a Microsoft subscription instead, see Cancel
or turn off recurring billing for a Microsoft subscription.

1. Sign in to your Order history with your Microsoft account. If you have more than one Microsoft account, sign in to each one to check your order history.
2. Do one of the following:
   • If you want to cancel the entire order:
     
     Find the order or pre-order you want to cancel, and select Cancel item next to the order.
   • If you want to cancel an item in an order:
     
     Find the order or pre-order you want to cancel, select Cancel item next to the item, select the check box next to the item, and select the Cancel item button.
3. Check your email inbox for an email confirming the order

Hi, as the Ambassador says you can cancel the pre-order by contacting Xbox support, I would recommend you call them by phone.

support.xbox.com/.../pre-order-faq

Can I cancel a pre-order?

Yes, before we release the game, you can cancel your pre-order by contacting Xbox Support.

Access your Order History and find the order or pre-order. Select Cancel Item next to the item you want to cancel. If you don't see this option, you've already been charged for the item, but you can request an exchange or refund. Select the checkbox next to the item and select the cancel item button.