Hi Rahul,
As per the issue description you are facing issue XBOX gift cards and having queries about XBOX gift cards. Here are few articles which might help you to get the answer of your queries. If issue persists, try to repost your query on XBOX support and hope you will answer of your queries.
Get gift cards for the Xbox Store, Windows Store and Microsoft Store
Learn about gift cards and prepaid codes
Hope the information provided is helpful. Do let us know if you have any more concern related to Windows. We will be more than happy to assist you.
Regards,