Any reseller familiar with Office 2013 will understand what a total disaster it is activating. If you answer isn't relevant to Office 2013 please don't answer.
Keeping track of multiple product keys under one account is difficult at best especially if you activated before they showed the product key of the one you were trying to install.
1) Is there a program or a web site that will tell you what account your POSA key is registered to?
2) Is there a program that you can run on the computer to show you the Office 2013 Product Key?