Well, this was complicated, so the best thing we can do is to issue new codes manually to anyone with this problem.
Please send an e-mail to email@example.com
and include three things:
- Your code.
- A screenshot from within Steam where we can see the code as well as your account name.
- The receipt that Steam e-mailed you.
When we see these things, we will send you a code back. I suspect there will be a lot of e-mails coming our way, so please give us a few days to respond. Steam will stop giving people the faulty codes from now on, but cannot fix the one already distributed, so this is the best solution we could come up with.
ONLY IF YOUR CODE STARTS WITH COMS, NO OTHER ISSUES WILL BE SOLVED THROUGH THIS ADDRESS
For other key issues, create a ticket at http://paradox.zendesk.com