DLC is non-refundable unfortunately.
Make sure you tried to clear your cache at least 3 times, then restart the console. I would also recommend deleting your account (Account only, not items) and downloading it again.
If nothing works for you, try contacting a Microsoft Xbox Support agent here: http://support.xbox.com/en-US/contact-us
1) Select the type of issue you're having
2) Specify the type of issue
3) Choose a method of contact
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