We've just done some maintenance on the codec system to make things a bit saner, and there is the possibility that some keys will have been resent. Nothing to worry about.
Please note, that you will not be charged - the payment system is separate from the system that sends them out.
If you are still worried for any reason, please email firstname.lastname@example.org
and we can look in to any further issues you may have.
Principal Software Engineer at Raspberry Pi (Trading) Ltd.
Please direct all questions to the forum, I do not do support via PM.