Fix your purchase could not be completed

Hello and thank you for using Apple Discussions,

Fisrtly, whether we can help you here or not depends on if the purchase is being processed by Apple (Such as in-app purchase App Store prompts, Apple Music subscriptions etc.)

If you purchase is processed by Apple, please contact Itunes support using this link: Choose your country or region - Official Apple Support

Thanks,

Maverick.

You have to contact iTunes support by using this link:

www.apple.com/support/itunes/ww

or contact apple care at:

Contact Apple for support and service - Apple Support

Good luck!