Try support:
https://help.minecraft.net/hc/en-us/request/new?ticket_form_id=360001225811
This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
My aunt jamie told me she has got an minecraft card for her birthday but after taking it out of her bag she found it the code at the back all scratched up and un readable so she gave it to me as it is no use for her. What can we do about this?"