Thanks for following this thread, @Tempest. I'll be your QuickBooks guide today. 

Since your 1099 has already been filed, you will need to manually amend it and work directly with the IRS. You can use these IRS instructions to do so.

For further information, see Correct errors on Forms 1099-MISC. 

Once corrected, you will need to provide the corrected return to the recipient or contractor yourself.

I'll be here if you need more help. Take care!