Contact Microsoft support

1-800-4my-xbox if you're in the US/Canada or http://support.xbox.com/contact-us

Hi,

it might be a issue with the card have you contacted the iprepaid card company to see if the card needs to be activated?

You can try here

https://support.microsoft.com/en-gb/contactus

Hello, first it's a pleasure to be able to help you today.

My name is welcome to the community and Happy New Year

Hello Miyashita, I regret that you are having difficulties with your payment, however try to contact support by the link below.

Go to: https://support.xbox.com/en-US/contact-us/

See the bottom left part of the page and make sure that the page has the correct region that you are in (ex: United States - English for USA)

If not, click on it then select the correct region that you are in.

Check and confirm that you are within the available time of support under Contact times.

Click Contact us

Select the drop-down menu options that will match your concern.

On the page, see the provided support articles that may help you with your concern. Click See contact options if further assistance is needed.

On the next page, select either Chat online or Request a call option then follow or enter the needed details.

Im looking for a number for Australia- thanks

Australia

Hours of Operations:

Monday - Friday: 09:00 AM - 9:00 PM 

Saturday - Sunday: 10:00 AM - 6:00 PM

Phone: (02) 8031-8186 

Contact page http://support.xbox.com/en-AU/contact-us?isChatCallAvailable=false