If you still have your original Office 2007 (25 chars), I can explain the exact phone activation steps to try — but success is unlikely today.
John corrected the error, and with a sense of relief and accomplishment, he activated his copy of Office 2007. The confirmation code "Abcdefg" had been validated, and John was back in business. Microsoft Office 2007 Confirmation Code Abcdefg
If the internet method fails, you can use the automated phone system: If you still have your original Office 2007