Sorry this won't help you now, but next time...
I received a fake GoDaddy invoice. It had their logo and the name of one of my domains that was about to expire. When I looked at the invoice it was from "XFIZJOULM". In the activity section, the account name showed up in Cyrillic characters, which the forum blocks me from posting, but Google translates as "Evgeny <removed>". Initially I went to "Report a Problem" and tried to file a case but got the message:
We’re sorry, you can’t file a case on this type of transaction. Please refer to our User Agreement for more details.
I can't repeat the steps I took (now that the invoice is canceled) but this is what I think I did:
1. Went into account activity.
2. Clicked on "view details" for the pending invoice.
3. Was given the option the PAY or CANCEL the invoice. I clicked CANCEL.
4. Wrote an appropriate message to the account that sent the invoice, i.e. "**bleep** off scammer".
5. Clicked whatever confirmation button I needed to to send the message and cancel the invoice.
It now shows up in my completed activity as "Canceled – Invoice Received" and there is a strike-thru on the amount.
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